Tropical Islands Resort near Berlin is a climate-controlled park full of activities. Its concept is similar to one recommended for the Astrodome's future.

The water park is home to the world's largest indoor rainforest, along with pools and beaches Holds a capacity of 6,000 visitors, along with 522 beds and 400 sunloungers ...

Rulantica at Europa Park in Germany hosts up to 3,500 visitors at a time. Outside there’s a further heated pool and more than 500 sun loungers for when the weather is warmer.