Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

A commemorative plaque at the door pays tribute to an "American Patriot" known for his betrayal.

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

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

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

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

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

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This tombstone marks the spot where the legendary British spy met his end.

Mussolini gave Cincinnati a bronze statue of Romulus and Remus suckling at a wolf's teats.

The final resting place of the most famous sharpshooter.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

Rare recess caves fill this unbelievably beautiful Ohio park.

The largest earthwork effigy in the world.

The angel of death appears to weep black tears at this grave marker.

Take a drunken tour inside the world's largest known geode.

The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

Beautiful waterfalls grace a canyon visibly torn by a violent tornado.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Right angles in the forests of Panama.