Walk 2,300 feet above the ground on the "Troll's Tongue."

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

This ducal residence was once home to a future Russian empress and a French king in exile.

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

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

Museum celebrating the achievements of the Soviet space program.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

Moscow's imposing monument to the Space Age.

Secret Soviet city once home to Russian cosmonauts and space training facilities.

Stunning examples of Russia's 18th-century wooden architecture.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

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

Commonly acknowledged as the only public monument to the Devil himself.