Skytsborg Tower (meaning sky tower), was built in 1679 by the Danes as a watchtower for the harbor of Charlotte Amalie. Located at the highest point on Government Hill, Danish soldiers used Skytsborg as a vantage point to spot enemy ships. It is not known what year Skytsborg Tower took on the name of Blackbeard's Castle, but the infamous Edward Teach, commonly known as Blackbeard, did sail the Caribbean waters in the early 1700s. It has become part of the lore of the island that he used the Tower as a vantage point for his own treacherous purposes. Blackbeard's Castle is one of four National Historic sites in the US Virgin Islands. It was the centerpiece of a private residence for many years, but now is surrounded by a small hotel (The Inn at Blackbeard's Castle), restaurant and pool.