This snug medieval lane is one of the narrowest streets in the world.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

Quite simply the largest tree in the world (by volume).

The final resting place of a space program monolith.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Hear the quietest sound from across the dome.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

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

A beautiful but toxic fountain of mercury.

Peek through the gates at this oasis from the city, full of Old English charm.

The middle finger of modernity.

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

The second oldest continuously operating bar in Louisiana.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The hallucinogenic center of the ancient world.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

The last of its kind in the country.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."