Scale the heights of this 100-foot play space shaped like a ferocious dragon.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

One of the world's largest collections of pathological specimens.

London's old-school healing garden.

This hidden green space is the city's second largest conservatory.

The curios of pharmacist and collector Henry Wellcome.

The anatomical-pathological collection of a man who changed surgery.

A hands-off space for graffiti artists to hone and display their skills.

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

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A student driver's nightmare.

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

Eighty million natural history specimens call this gargantuan museum home.

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

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

One of the world's tallest statues is also one of its most hated.

A sculpture park of the tossed aside relics of the USSR, from Stalin to a massive Soviet emblem.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.