7 of the World's Coolest Designed Gyms

Who knew Iran had such an eye for fitness center design? Second case in point: this insanely cool, glacier-esque rock climbing hall.

It may not have the wow factor of the Iranian designs, but the track at Nike's world headquarters is serenely beautiful and made out of 50,000 pairs of recycled Nike sneaks.

Hidden inside these massive, industrial-looking silos is an enormous and crazy-colorful rock climbing center.

David Barton gyms are notoriously kooky, and this one—housed in a former Episcopal church turned drug rehab center turned mega-nightclub (Limelight, anyone?)—is no exception.

This triangular building seems to defy the laws of physics. But despite its über-modern feel, it was built more than 40 years ago.

Indulge your every fairy-tale fantasy at this Tokyo gym's Alice in Wonderland-inspired climbing wall.