America's most famous piece of self-built architecture.

World's largest collection of serial killer artwork and other macabre exhibits.

It looks like a whale, it's part of Yale, and it's best-known by a nickname you can probably work out for yourself.

Connecticut's shot tower is near the end of its life.

An extra-wide chair built to accommodate the former president's big behind.

Underground tunnels remain beneath this abandoned mental asylum.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

An incarceration museum on the spot of possibly the oldest prison in England.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

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

London's smallest police station is barely the size of a phone booth.

Climb to the top of the world's largest seated bronze Buddha.

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

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

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

Once the home of a hermetic monk, this cave now houses a small church.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Legends surround an ancient tree trunk riddled with nails for good luck.