If you like to swim while you're in Amsterdam, you should visit the Zuiderbad. It's located near the Museumplein. It was build in 1897 and became a swimming pool in 1912, since then the design has stayed the same which creates a great swimming experience.
The water in the swimming pool isn't heated and this was terrible when I was a small kid that had to go the Zuiderbad for swimming lessons, but the last time I visited it didn't bother me at all. I enjoyed swimming in this classic building in the city center of Amsterdam.
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