Since the opening of the first park, the indoor water park business has become increasingly popular, especially for
Edmonton in
Canada, and
Wisconsin Dells in the U.S., which proclaims itself as the "Water Park Capital of the World". The Dells has five water park resorts that have at least one water park bigger than . This includes
Great Wolf Lodge,
Kalahari (Wisconsin's Largest Indoor Water Park),
Chula Vista Resort (Lost Rios),
Wilderness Territory (Wild West, Klondike Kavern, Wild WaterDome), and the
Hotel Rome at Mt. Olympus. Wisconsin has the most indoor water parks in one state. Other states in the U.S., especially in the midwest, are building more indoor water parks separate or to existing hotels so they can become a year-round destination. More water parks are also being built in Canada,
Europe and
Asia. Using a large hangar intended for
Cargolifter Zeppelins,
Tropical Islands Resort near Berlin,
Germany, is since 2004 the largest indoor water park in the world with an area of 66,000 m² (710,000 sq feet). As the hangar is high, it is one of the
largest buildings on Earth by volume at 5.5 million m³ (194 million ft³). File:Tropical Islands 5.jpg|Tropical Islands Resort - inside File:Tropical Islands Innenansicht.jpg|Tropical Islands Resort - inside, with the dome-shaped roof of the building visible File:Krausnicker Berge Aussichtsturm Blick auf Tropical Islands.JPG|Tropical Islands Resort - outside File:Great Wolf Lodge Mason, Ohio.jpg|
Great Wolf Lodge at
Mason,
Ohio ==Features==