This once-derelict building is now one of the most beautiful bookstores in the world.

Yugoslavia's biggest underground airport lies in ruins.

This Soviet-era athletic and recreation facility is the highest ice skating rink in the world.

This Soviet statue is based on a piece of propaganda that's been elevated to national myth.

Nicknamed Kazakhstan's Grand Canyon, this natural wonder lies east of Almaty near the Chinese border.

The unexpectedly beloved remnants of a controversial thermal power plant.

A striking symbol of the Bulgarian capital.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

A slice of central Asia in the middle of Berlin.

These barriers stand as stark reminders of Northern Ireland's troubled past.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

This expansive bridge in the Canadian wilderness was originally just built for friends.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

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

Berlin's old airport.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

This abandoned Belgian fortress is purposefully being left to nature.

The secret medieval communication system will whisk your words above the noise of the crowd.

Giant cauldrons overflow with Uzbekistan's favorite rice dish at this cavernous dining hall.

An underground world of gorgeous, palatial metro stations designed as a nuclear shelter complex.

This huge metal monument is slowly being stripped to its concrete skeleton.

World's oldest and largest space launch facility, once a secret missile testing site.