This skewed English house has looked like it's going to fall over for centuries.

Surreal riveted sea forts once protected the Kent shores from German attack.

An artistic tribute to the famous singer, just around the corner from where he was born.

"Unity, Creativity, Beauty."

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

Rock carving created 1,300 years ago 75 feet off the ground.

The Tudor-style cottage in the middle of the square is not quite what it seems.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

Giant, friendly pelicans in Central London, the most unlikely of places.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

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

This half-finished "city of toys" was almost Italy's own Las Vegas.

Eighty million natural history specimens call this gargantuan museum home.

Pop culture has helped to keep this iconic British building from being destroyed.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

Museum in a swimming pool where the water still flows.

This unique building in the main square stands out among the city's typically Baroque architecture.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

These medieval skyscrapers dominate the skyline of this small Tuscan town.