The Giant's Ring is an ancient henge monument located in Belfast, Northern Ireland. It dates back to the Neolithic period, around 2500 BC, and is believed to have been used for ceremonial and ritual purposes. The site consists of a large circular bank and ditch, with a single entrance
From Wikipedia
The Giant's Ring is a henge monument at Ballynahatty, near Shaw's Bridge, Belfast, Northern Ireland. The site is a State Care Historic Monument and also a Site of Special Scientific Interest.