Artificial tropical resort in Germany

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.