Some hotels have accommodation underwater, such as Utter Inn in Lake Mälaren, Sweden. Hydropolis, under construction in Dubai, will have suites on the bottom of the Persian Gulf, and Jules Undersea Lodge in Key Largo, Florida requires scuba diving to access its rooms.
The Library Hotel in New York City is unique in that each of its ten floors are assigned one category from the Dewey Decimal System.
The Burj al-Arab hotel in Dubai, United Arab Emirates, built on an artificial island, is structured in the shape of a boat's sail.
The former ocean liner RMS Queen Mary in Long Beach, California uses its first-class staterooms as a hotel.
The Jailhotel Löwengraben in Lucerne, Switzerland is a converted prison now used as a hotel.
The Sheraton Doha Resort & Convention Hotel in Doha, Qatar is known as the Pyramid of the Gulf due to its pyramidal structure.
The Liberty Hotel in Boston used to be the Charles Street Jail.