The charmingly disheveled clock tower of Tbilisi's puppet theater.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

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.

This small shrine is dedicated to the designer of the first Russian fighter jet and his brother, who became Chairman of the Presidium of the Supreme Soviet.

Despite producing just a handful of movies, a brave and lyrical filmmaker has an entire museum dedicated to him.

This snug medieval lane is one of the narrowest streets in the world.

This historic black and white monastery is one of Bulgaria's architectural jewels.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

South Korea's only sex-themed park.

The best place for scenic views of the DMZ and North Korea.

Secret North Korean passage discovered below the world's most dangerous border.

South Korea's largely symbolic, barely used gateway to the North.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

A musical instrument played by the sea.

This museum houses an imposing skeleton army comprised of creatures great and small.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

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

This Parisian gem is one of the most incredible ethnographic museums in the world.

One of Jeff Koons’s largest sculptures and his first commemorative work.