Old Kirk Lonan, also known as Lonan Old Church or St Adamnan's, stands on Ballamenagh Road near Baldrine on the Island's east coast, between Groudle Glen and the shore. Its Manx name, Keeill ny-Traie, means "the chapel by the shore," and the site holds early Celtic crosses, the oldest reputedly dating to the 5th century AD, pointing to a very early Christian presence; the church itself is dedicated to Adomnán, Abbot of Iona between 679 and 704. Around 1190, King Reginald is recorded as having granted land, likely including this site, to St Bees Priory in Cumbria. The old kirk was superseded as the parish's main place of worship after an Act of Tynwald in 1733 provided for a new church at Boilley Veen, though it was later restored by the Reverend John Quine after he became vicar in 1895, and the Friends of St Adamnan's, formed in 1968, have maintained it since. It remains a registered protected building on the Isle of Man.

The Golden Meadow Mill, on Alexandra Road, is believed to be the earliest town mill on the Island and one of the first "Lord's Mills", first documented in the Manorial Roll of 1511-1515 as "two grain mills near the Castle", with William Hubart recorded as tenant. Its mill leat runs down to Castle Rushen itself, and the castle is visible on a direct line from the mill's wheels, underlining the close historical relationship between the two sites. Unusually, the mill had two water wheels side by side, one driving the corn mill and the other a separate threshing mill, and its four-storey limestone building still stands with a drying kiln in an attached extension. It remained in use until 1981, when deterioration of the wheel and the sale of its machinery finally brought milling here to an end; the site has since been restored and converted to holiday accommodation.

The Old School House stood at the top of the green in Cronkbourne Village, a model housing scheme built by sailcloth manufacturer William F. Moore for workers at his Tromode factory, designed by architect Ewan Christian (later President of the RIBA) and thought to be the only such workers' village on the Isle of Man outside the mining industry, predating better-known English examples like Port Sunlight and Bournville. The building served as the centre of village life, doubling as a school, which gave local children free education well before it became compulsory, and as a chapel, which remained in use until as late as 1964. The village is also known as the birthplace, in 1864, of the designer Archibald Knox.

No verifiable history was found for this building beyond its identification as the Old School House in the St Marks village settlement, Ballasalla.

Old St Runius (Old Marown Church), dedicated to Ma Rooney/St Runius, was built around 1200 and served as Marown's parish church until 1853. It was extended westward in 1750-55 using moulded stonework reused from the ruined St Trinian's Church in the same parish, and its original south doorway and windowless north wall survive from the 12th-century build. After serving as a mortuary chapel it fell into disrepair, but volunteers restored it and it reopened for occasional services on 9 August 1959.

The Old Station on Station Road was built as Kirk Michael's stop on the Manx Northern Railway, opening on 23 September 1879 partway along the line between St John's and Ramsey; as the largest village on that stretch, Kirk Michael had been intended from the line's 1877 survey as a principal intermediate station and passing place, and it was given substantial sandstone, slate-roofed buildings comprising a stationmaster's office, waiting room, goods shed and water tower. The station remained in use for nearly ninety years, closing on 6 September 1968. Since 1981 the former station building has housed the local fire brigade, with the goods shed converted to garage the fire engine, while mock level-crossing gates and lengths of rail set into the road recall its railway past along the Heritage Rail Trail.

Old Thatch on Brunswick Road, Douglas, is a thatched dwelling included on the Isle of Man's Registered Buildings list. No further verifiable historical detail about its construction date or history could be found.

Parish and village on the east coast of the Isle of Man, immediately north of Douglas. Robertson described Kirk Onchan as one of the smallest parishes on the Island, bounded by Lonan, Braddan and the sea. The village of Kiondroghad, which he translated as Bridge-end, stood about two miles from Douglas on the road north towards Ramsey by Laxey. The parish's creeks included Crowdale, Bankes Harbour, Port Cooyn and Port y Artay. Barley and oats were the prevailing crops, and Robertson noted four corn mills within the parish. The parish contains a number of prehistoric remains. On the quarterland of Ballachrink a ruined stone monument was described with a circle of stones around its base. About a hundred yards to the west stood an associated tumulus, with traces of a circular enclosure nearby. At nearby Ballacottier another cairn was noted, composed largely of stones which appeared to have been exposed to fire. A gold noble of Edward III was found at Slegaby in Onchan. Nineteenth-century writers placed it among a number of significant coin finds on the Island, alongside discoveries from Bradda Head and other sites. Onchan also retained a strong body of folklore. One account recorded the belief that fairies rode horses at night, leaving them wet with perspiration by morning. In the village itself a phantom carriage was said to pass rapidly through at night, though however carefully people watched for it no one could see it. The parish grew rapidly as Douglas expanded northwards in the nineteenth and twentieth centuries, but the older settlement remained centred on the route between Douglas and Laxey.

Onchan Parish Hall, at the top of Royal Avenue, is also known as Onchan Village Hall and was designed by the noted Arts and Crafts architect Mackay Hugh Baillie Scott in an Art Nouveau style. Although often called St Peter's Church Hall locally, it is not part of the neighbouring church. It was registered as a protected building on 11 September 1989 and remains in daily use by community groups, including Stage One Drama.

Onchan Parish War Memorial commemorates parishioners lost in the First World War; it was designed by the celebrated Manx artist Archibald Knox, with a wheel cross and Celtic interlace pattern echoing a cross in St Peter's Church, and carved by the Douglas mason T.S. Quayle from a block of Irish limestone set into a five-ton glacially-borne Scottish granite boulder. The land at the junction of Church Avenue and Main Road was donated by the trustees of the late James Spittall, and the memorial was unveiled on 16 November 1924 by Mr and Mrs R.M. Broadbent before the Lieutenant Governor. A Second World War memorial tablet, designed by Wilfred T. Quayle, was later added, and road-widening in the early 1980s saw the whole memorial relocated to its present site near Elm Tree House in 1982. It was formally registered as a protected building on 7 July 2021.

Ooig ny Seyir ("Cave of the Carpenter") is a sea cave on the coast beneath Cronk yn Iree Laa in the parish of Patrick. Fishermen reported hearing the sounds of woodworking from within, variously explained as elementals making barrels for the herring catch, building boats, or - most ominously - making coffins. The sounds were said to be heard with unusual vigour before a disaster befell the Peel-side fishing boats.

Orrisdale House was for a time home to the Crellin family, prominent in Manx ecclesiastical life: the Reverend John Crellin (c.1738-1808), Rector of Bride and Vicar General, and central to the first translation of the Bible into Manx, is associated with the property. An 1870s tourist guide to the Island described the house as 'a large family mansion, prettily surrounded, and comfortable in the extreme,' noting it was 'almost enveloped in leaves in the summer season.'

The Orrisdale Limekiln is a ruined former lime kiln near Orrisdale Head, part of the agricultural and industrial heritage of the Kirk Michael coastline. Beyond its location and registered status, no further verifiable historical detail could be found online.

The outbuildings at Staward Farm, Sulby, are registered as farm buildings within Sulby, a village on the Sulby River known for its position at the foot of the northern hills. No further verifiable detail about the specific outbuildings themselves could be found online.

The outbuildings at Thurot Cottage, on Thurot Cottage Road in Bride, are registered as farm buildings. No further verifiable historical detail about them could be found online.

This pair of red K6 telephone kiosks on Drumgold Street is registered as a protected pair on the Isle of Man. No further verifiable historical detail beyond their registered status and standard K6 design could be confirmed.

Parkfield Corner is the sharp right-hander taken just after leaving the TT Grandstand start area on Glencrutchery Road, where competitors dropped down off the Mountain Course onto the Willaston Circuit loop. Wikipedia's article on this road junction identifies it by its everyday name, St Ninian's Crossroads, on the A2 Douglas-to-Ramsey road between the Grandstand and the 1st Milestone, and confirms it was used as 'Parkfield Corner' both for the Clypse Course (1954-1959) and the later Willaston/Manx Classic circuit (1988-2000). The junction had earlier also formed part of the Highland Course and Four Inch Course in the 1900s-1920s.

Parliament Square is Ramsey's central square and a multi-road junction, where riders take a hard right-hander after fierce braking down from Glentramman. It is immediately followed by a medium left-hander that sends the course back out of the square along Queen's Pier Road - one of the tightest, most technical sequences on the whole Mountain Course, in the middle of a town rather than open countryside.

Parville, on Ballagawne Road near Ballabeg, is registered as a manor house. No documented history of the building beyond this register description was found.

Harbour town on the west coast of the Isle of Man, at the mouth of the River Neb opposite St Patrick's Isle and Peel Castle. Peel grew around one of the principal western landing places on the Island. The castle and cathedral occupied St Patrick's Isle at the harbour entrance, while the town developed along the shore and the banks of the Neb. Fishing was the principal industry. Peel became particularly associated with the herring fleet, and its harbour filled with fishing boats, curing activity and the stores needed to supply crews. The herring trade linked the town with Ireland, Scotland and ports on the English coast. The limitations of the harbour were repeatedly raised by local merchants. George Moore, whose business was based in Peel, promoted a scheme to improve the harbour and sought subscriptions towards the work. The proposals were supported by Peel merchants and examined by English engineers, but other Manx ports opposed improvements which they feared would divert trade towards Peel. St German's Cathedral stood within the walls of Peel Castle. The castle also served as a garrison and prison. Edward Christian was confined there during the Stanley period, and the site continued to be used for prisoners under the Commonwealth administration. The town itself was closely packed around the harbour. Fishing boats were drawn up or worked from the shore, while the castle above formed the most conspicuous landmark. The Neb connected the harbour with the inland district of German and the road eastwards across the Island. Peel also retained a strong body of local tradition connected with the castle, St Patrick's Isle, the cathedral and the surrounding coast. The better-known stories attached to the castle include the Moddey Dhoo, but the town's documentary record is dominated by fishing, harbour improvement and the activities of its merchants.

Peel Castle occupies the whole of St Patrick's Isle, a small tidal island off Peel on the Isle of Man's west coast. It was originally fortified by Norse rulers in the 11th century under King Magnus Barefoot, beginning as timber defences later rebuilt largely in local red sandstone during the early 14th century. The site was also the seat of the Diocese of Sodor and Man, home to the Cathedral of St German, until the cathedral fell out of use in the 18th century. Excavations between 1982 and 1987 uncovered the 10th-century grave of the so-called 'Pagan Lady' furnished with Norse grave goods, along with a hoard of silver coins from around 1030. Now cared for by Manx National Heritage, the castle appears on the reverse of the Isle of Man's £10 banknote and remains one of the island's most visited heritage sites.

Peel's harbour, sheltered by St Patrick's Isle, grew into the Isle of Man's most important herring port; harbour improvements were being petitioned for as early as 1759. Its breakwater was built in 1856 and extended in 1896, when the current breakwater lighthouse was established. At the height of the herring fishery, boats from Scotland, Ireland and the Isle of Man landed catches here to be salted and smoked into the Manx kipper, a trade that shaped the town's economy into the 20th century.

Peel Heritage Centre, on Mill Road, occupies the former Peel railway station and its water tower, built in the early 1900s in an Arts and Crafts style; the water tower, notable for its rare slate tank, is the most intact survivor of the site's railway infrastructure. The Isle of Man Railway station here opened in 1873 and closed in 1968, after which the main station building became part of the House of Manannan museum complex while the surrounding site was redeveloped for tourism. It was registered as a protected building on 2 September 2025, one of thirteen historic structures recognised together that day for spanning over 800 years of Manx heritage.

Peel Police Station, formerly Peel Court House, on Derby Road, was registered as a protected building on 20 October 2014. No further verifiable history of the building's construction or judicial use was found.

The Philip Christian Centre on Christian Street, Peel, was formerly Christian's Endowed National School, built in 1860 and later refurbished for community use. It was registered as a protected building on 6 May 1986, one of the earlier entries on the Isle of Man's Protected Buildings Register.