With so many hotels all over the world, some are more impressive than others. While the average hotel may have no distinct features, the world has some incredibly unique hotels as well. These are all memorable for one significant reason or another.

Manta Resort, Tanzania

One such hotel is the Manta Resort, on Zanzibar’s Pemba Island. Its most unusual room is entirely underwater. With clear walls, guests can watch the fish floating past the room, from the comfort of the bed. Spotlights are located under each of the room’s windows. When the spotlights are turned on, it attracts octopuses and various fish. Guests can even engage in scuba diving without leaving the hotel.

Golden Crown Levin Iglut, Finland

The Northern Lights of Finland provide a breathtaking view. When guests stay at the Golden Crown Levin Iglut, they sleep in a glass igloo. Insulated, heated windows keep guests warm in the cold environment. The lodge also has a fireplace to keep guests warm, either before or after they soak in the hotel’s hot tub, located outdoors, and providing views that have to be seen to be believed.

Kokopelli’s Cave, New Mexico

In New Mexico, one of the most unique hotels is Kokopelli’s Cave. This bed and breakfast is located in a remote section of Mexico, called Farmington. The hotel is situated 300 feet beneath Mexico’s La Plata River Valley. A staircase takes guests down 70 feet to a circular cavern measuring 1700 square feet. This unique B&B boasts waterfall showers and jacuzzis.

Book and Bed, Tokyo

Tokyo is the home of the Book and Bed. The hotel was designed to remind guests of a bookstore. However, behind its bookshelves are nooks that hold the guests’ beds. The shelves provide guests access to library books written in both Japanese and English. Close to the bookshelves are couches where guests are encouraged to sit and read.

Hotel Costa Verde, Costa Rica

Costa Rica holds the Hotel Costa Verde. Guests of the hotel sleep in a Boeing 727 dating back to 1965. The plane was adapted to a guesthouse with two bedrooms. Through the windows of the plane, guests have a view of the ocean and the jungle. The wings of the aircraft were turned into patios, to offer even more luxury to guests of the hotel.