45.) The Nemo 33 Indoor Pool Located In Brussels, Belgium
Nemo 33 is the largest indoor pool that holds non-chlorinated water. It is also the deepest in the entire world! It is yet another adrenaline-filled swimming pool for the brave divers and swimmers. It has a depth of 113 feet equivalent to a 14-storey building. Plus it is dark and nothing much going on below.
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