Star Castle, Isles of Scilly
St. Mary's, United Kingdom
Star Castle is a fortress on St Mary's, Isles of Scilly, built in 1593 by Robert Adams, Surveyor of the Royal Works (d.1595) and Francis Godolphin, Captain of the Scilly Isles, during the "Spanish invasion scare."
Hotel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).