A small castellated stone tower on a reef in Douglas Bay, built in 1832 to give shelter to sailors wrecked on the submerged rock known as Conister Rock. The tower is now a protected structure and a distinctive landmark visible from the promenade — a small gothic folly sitting on what amounts to a few square metres of exposed rock in the middle of the bay.
The tower is not accessible to visitors but is visible from anywhere along the Douglas promenade. It appears on the Manx coat of arms and is one of the most photographed spots in the island's capital. The Bay of Douglas wreck rate was historically high; the tower and the nearby lifeboat station represent a long tradition of maritime rescue on the island.