Paris' linguistic guide to the international language of, yes, love.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

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

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

Life-sized painted illusions let pedestrians blend in with the street art.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

Home of the unusual art of water puppetry, one of Vietnam's oldest curiosities.

This bridge is embedded with a giant steel dragon that breathes fire from its mouth.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

This ancient Roman aqueduct once funneled water to Diocletian's palace.

The local club's soccer field is practically surrounded by UNESCO-protected monuments.

The interior of this church has been turned into a memorial to locals who died in Croatia's Homeland War.

Where the lovelorn find a home for their sentimental keepsakes.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

The haunting ruins of a military fortress turned astronomical observatory sit on a Sarajevo mountaintop.

A war-torn Olympic relic is being overtaken by graffiti and nature.

A monument on the pavement marks the spot where two cultures that shaped Sarajevo come together.

The first mosque in the world to receive electricity.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

Place with alleged mystical powers in Old Orthodox Church in Sarajevo.

Some of the best-preserved specimens of the monumental medieval tombstones found throughout Bosnia and Herzegovina.

This enormous abstract sculpture is part jungle gym, part elaborate noise-making machine.