The AquaDom in Berlin, Germany, is a 25 metre tall cylindrical acrylic glass aquarium with built-in transparent elevator. I was in Berlin and wanted to go but didn't have time...next time I go back to Germany this is definitely on my list of places to go
The Dead Sea - Israel. The most astonishing swimming experience I have ever had. The concentration of the minerals keeps you floating. I was in the water floating and reading a magazine. Fantastic. But don't get water in your eyes. Luckily there are showers at the beach to rinse your eyes. Go to the Dead Sea. In my opinion an absolutely must see.
35 Wondrous Split Images Showing The Beauty Of Two Worlds