Bermuda is a British Overseas Territory in the North Atlantic Ocean, located off the east coast of North America. It is one of the last remains of the once vast British colonial empire in North America. It consists of about 138 islands and islets, with all the major islands aligned on a hook-shaped, but roughly east-west, axis and connected together by road bridges. Despite this complexity, Bermudians usually refer to Bermuda as "the island".  Bermuda's pink sand beaches and clear, cerulean blue ocean waters are popular with tourists. Many of Bermuda's hotels are located along the south shore of the island. In addition to its beaches, there are a number of sightseeing attractions. Historic St George's is a designated World Heritage Site.  It's most famous visitor attraction is the Royal Naval Dockyard, which includes the Bermuda Maritime Museum. Other attractions include the Bermuda Aquarium, Museum and Zoo, Bermuda Underwater Exploration Institute, the Botanical Gardens and Masterworks Museum of Bermuda Art, lighthouses, and the Crystal Caves with stalactites and underground saltwater pools.