Notorious artist squat renovated into legal studios.

This massive library holds what was once the largest book collection in the world.

France's most famous cemetery, with some of its most curious tombs.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

There has been an astronomical clock on this spot since the 14th century.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

Visible below the waves are memorials to the city's Gold Rush dead.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Men and special assistants stand by the road to sell the day's catch in this lakeside village.

Hundreds of intricately carved Armenian stone crosses can be found within this huge cemetery.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

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

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

On high feast days, the entire blue-glass front of this modern church opens up to reveal the small wooden church inside.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

Pilgrimage site for star-crossed lovers.

These elaborate gothic monuments honor Verona's medieval lords.

A unique market that brings together various goods and cultures.

This bakery sits on the site of the Black Panther Party's first headquarters.

Op-art architecture designed for happiness.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

This small church was constructed over the ruins of three temples dating to the Roman Republic.