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Photo: Public Record Office of Northern Ireland, No restrictions via Wikimedia Commons
The castle was built in the 17th century, rebuilt in 1813, burnt down in 1922, and the ruins were cleared away in the 1970s. The buildings that remain illustrate its late Georgian concept of Tudor-Gothic: there's an Italianate stair tower, a Barbican gatehouse and a stable block - this has been renamed Clotworthy House and now hosts weddings, conferences and the like. The chief attraction is the restored 17th century Anglo-Dutch water gardens. The main entrance is from Randalstown Rd to the north, but from town centre it's easier to enter through the Barbican from High St. Limited parking here, use one of the other town car parks.
Antrim Castle or Massereene Castle was a fortified mansion in Antrim, County Antrim, Northern Ireland, on the banks of the Sixmilewater River. It was built in stages between 1613 and 1662. It was destroyed by fire in 1922 and finally demolished in the 1970s. All that remains are a slightly raised grassed platform as well as a freestanding Italian stair tower built in 1887, and a gatehouse built around 1818 with twin neo-Tudor towers, with older connecting walls. The gardens are a popular tourist attraction on the Randalstown Road in Antrim.
© OpenStreetMap contributors
The first castle of 1345 was called Eden-duff-carrick; it was replaced in the 17th-century Plantation era. This second castle grew and grew, and was still incomplete when it burnt down in 1816. That's the shell that you see today. The grounds are a working farm plus event space - society wedding or steam traction rally, take your pick - and not otherwise open. But it was a location for Game of Thrones so it's on the circuit for GoT tours.
This is a water-powered mill for making spades and shovels, still in working order and maintained by the National Trust.