A forgotten and crumbling Yugoslav monument to the victims of fascism.

This soviet pilot's graveyard is filled with headstones made of airplane fins.

Rusted cars, trucks, and buses form a fascinating collection of Soviet-era machinery.

Yugoslavia's biggest underground airport lies in ruins.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.

Hidden beneath the streets of London is a secret subway that only carried mail.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

This abandoned secret city is a crumbling wonderland of Soviet ruins.

When Croatia became independent of Yugoslavia, the splintering governments left behind these concrete tunnels.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

A cliff-hanging restaurant.

Beijing's expansive subterranean hiding spot now crumbles away as a tourist destination.

A progressive LGBTQ hub offers dancing, HIV testing, art, and more.

Concrete crosses scattered across the Arizona scrubland which were used to align spy satellites.

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

One of the world's southernmost bars.