An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

In Egypt's expanding metro area, many of the neighbors are dead.

340-foot statue built to honour the Heroes of the Soviet Union.

This lake-bound geographical marker sits at the point where three European countries intersect.

One of the world's most complex timepieces.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

Astonishing rock formations dot the Brimham Moor landscape.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

The "dragon babies" of southeastern Europe.

This magical museum celebrates the life and work of a seminal children's book writer (and occasional spy).

North Korea's massive "hotel of doom."

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

The best-preserved Roman small town in North Africa.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

A subterranean house of worship carved right out of the bedrock.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

Cliffs full of fossils at the portal to England's Jurassic Coast.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

A little sculpture with a large wardrobe.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

Museum celebrating the history of computers, especially their role in codebreaking.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

The world's oldest model village.