The commemorative stone column conceals a secret laboratory.

The Great Fire of London and the regulation of one-way streets both started in this alley.

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

One of the world's steepest streets seems to have houses sliding down it.

This electric green sulphur lake in New Zealand looks like a cartoonish radioactive dump site.

One of England's most famous churches hides a pair of little known architectural treasures.

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

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

The decommissioned submarine is now the symbol of a small, inland Australian town.

The Victoria-era quarantine station for Sydney.

The longest fence in the world stretches over 3,000 miles to keep the dingoes out.

A massive metal lobster welcomes tourists to a roadside restaurant.

Once housing children next to hardened criminals this historic jail once displayed Ned Kelly's skull until it was stolen.

This historic Melbourne bullet factory is fully encased in a massive glass and steel cone.

Come for the flowers, stay for the bats!

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

Alien rock formations grown from the sands of an Australian national park.

A small, but award-winning beach known for its literally spotless reputation.

A disastrous D-Day rehearsal was relatively unknown until this sunken tank was discovered 40 years later.

England's most notorious suicide spot.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

This giant geoglyph of mysterious origins is now the site of neo-pagan rituals.