This ancient Irish tower could easily have stood in for Rapunzel's prison.

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

A super-sized promotional trick that is now a D.C. landmark.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

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

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

At 207 feet, one of the world's longest continuous escalators.

A much-maligned monument to teetotalism.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

World-famous, Pink's still manages to keep its prized cult fetish status.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

A one-of-a-kind collection of a unique medium.

The fairy tale castle of the "fairy-tale king."

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

An artsy hidden staircase leads to breathtaking views of San Francisco.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

A huge musical instrument played by the ocean.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

On Japan's Tashirojima Island, cats are king.

One of Canada's most incredible rare book collections holds hundreds of thousands of gorgeous tomes that the general public can touch.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

The final resting place of New Orleans' most famous voodoo priestess.