The strangest hotel is the underwater hotel.

Underwater Hotel There is an underwater hotel at the bottom of Lake Meralen in Sweden. To stay in the hotel, you must take a rubber boat and stay in the middle of the lake one kilometer offshore. The guest enters a cabin floating on the lake, then sinks more than 3 meters below the water surface and lives in the only room. This is a standard "aquarium". Through the surrounding glass windows, you can see the fish swimming around. The hotel has all the basic living facilities, including swimming and fishing, but there is no restaurant. In addition to bringing their own meals, passengers can also request special catering delivery services.