Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

A surrealist timepiece by the artist of melting clocks.

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

Stockholm's deepest subway station is also a stunning ecological wonder.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

A small collection of magic tricks and memorabilia is now an apartment-sized museum.

The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

This bridge is haunted by the ghost of a distraught mother.

Running since 1864, this clock has yet to be wound, one of the longest-running science experiments known.

This small chapel holds the mummified heart of one of the heroes of the Greek Revolution.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

A ruined castle has more than its fair share of legends and ghost stories.

One of the largest and most scenic of Bangladesh's tea gardens.

Celebrating the Eucharist, the day is a legal holiday in many parts of Germany.

This 1,700-pound edible sculpture is way better than your average chocolate mousse.

A giant doughnut was given to the small New Zealand town of Springfield to promote "The Simpsons Movie."

A horse statue that receives constant makeovers from graffiti artists and locals.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

A library where thousands of books explain how to avoid another Great Recession.