This historic recreationist school churns out warriors that may very well have had a fighting chance in Rome's pits of the day.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

A Belle Epoque bordello turned into a themed love hotel.

This demon atop the Notre-Dame de Paris looks utterly bored.

Inside a former cabaret, seven floors of erotic art.

One of Jeff Koons’s largest sculptures and his first commemorative work.

The video game-themed street art first popped up in the French city.

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Abandoned railway line circling the city of Paris.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This egg-shaped treehouse was inspired by "sport sleeping."

An enclosed rotunda at the Henry Art Gallery in which viewers can look up and see the uninterrupted sky.

Medical and zoological curiosities for sale.

This sculpture presents commentary on a life in pursuit of profits.

A cake-themed art installation tucked away in historic Chinatown.

Once strictly off-limits, this lower level housing curious and priceless vehicles of the Petersen Automotive Museum is now open to the public.

The final resting place of a space program monolith.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

World's largest collection of serial killer artwork and other macabre exhibits.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Rumored to be a giant robot in disguise, this colossal chef has been the beloved symbol of Tokyo’s kitchenware district for decades.