Founded as a refugee camp, now a popular tourist spot.

A spectacular rainbow of stained glass makes the "Pink Mosque" one of the most beautiful in Iran.

Iran's colorful terraces are a rare geological masterpiece.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

In the hinterlands of Serbia's capital, a giant reflective mushroom houses an aeronautical history of the former Yugoslav republic.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A pair of connected skyscrapers form this symbolic gateway.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

This ghost town in Belgium will lose its street art when it ceases to exist.

A surrealist timepiece by the artist of melting clocks.

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

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

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

The once highest point in China blends symbolic design with a kick of adrenaline.

An collection of Chinese propaganda posters from 1949 to 1979.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A winding path built in secret on the edge of the continent.

An artsy hidden staircase leads to breathtaking views of San Francisco.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

Welcome to the world's only museum dedicated to the Ukranian Easter egg.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The world's oldest bookshop still in operation.

Museum dedicated to wax representations of disfiguring diseases.

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.