14. Grüner See: a park that “sinks” every spring
Grüner See is near Hochschwab Mountains. During winters the entire area is completely covered in snow. When the snow melts in spring, the park’s lakes get overwhelmed and the entire park sinks under water. Reason: simply because there is so much snow on the mountains.
The most incredible thing is how impeccably intact the park remains underwater. If you were to dive in there you would see benches, bridges, plantation even the alpine flower intact, which is not supposed to survive under water.
Halfway through the summer, water level starts lowering and the park arises from beneath. In older cultures people used to worship such places.