What do you do with three abandoned sewage treatment silos? If you're the city of Amsterdam, you convert them into absolutely incredible climbing towers.

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These incredible structures are the results of a contest to determine their best adaptive reuse, won by Amsterdam's own NL Architects. The towers now have climbing surfaces both inside and out as well as multi-purpose areas, offices, restaurants and other commercial spaces. How cool is that?

[Designboom via Inhabitat]