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

The most playful of the life-sized statues that make up Singapore's "People of the River."

Singapore's landscaping project is home to 18 incredible Supertrees.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

An enormous public square and parade ground built to celebrate Ghana's independence.

The clever workshop that has been designing some of the most unusual coffins imaginable.

Where thousands of slaves passed through the "Door of No Return."

A black and white solution to the Bolivian city's traffic problems.

The soaring gondola lines form the longest aerial cable car system in the world.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

A shrine of fire worship built on top of a natural flame.

Museum preserving torture methods from the past.

This private residence was the template for one of the most beloved television homes of all time.

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

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This probably wasn't what Mao had in mind.

Why walk on this historical site when you can zoom down instead?

The most famous location in China was home to whole dynasties worth of imperial rulers.

More than 200 unconventional musical instruments that anyone can play.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Two thirds of this Montreal neon icon has survived to flash another day.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.