Tropical Islands Resort is an artificial tropical resort in Krausnick, Germany. It is said to have the world’s largest tropical indoor pool which can accommodate up to 8,000 visitors a day. It is also the world’s largest indoor waterpark at 66,000 m² (710,000 sq feet).
It is inside a disused hangar 360 metres (1,181 ft) long, 210 metres (689 ft) wide and 107 metres (351 ft) high. The air is kept at a warm 25 °C (77 °F).
At 5.5 million m³ (194 million ft³), it stands as one of the largest buildings on Earth by volume, and is the world’s largest single hall without supporting pillars inside.
Credit - www.webandtime.com