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

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

One part local history, 99 parts gruesome haunted house.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

The first declared National Monument in the United States.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

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

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The most visited, and possibly most controversial, museum in Germany.

A beautiful geyser under environmental threat.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

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

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The second oldest continuously operating bar in Louisiana.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

France's most famous cemetery, with some of its most curious tombs.