This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

It's believed a castle existed at this site since the 12th century.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

Time stands still at this serene burial ground in the center of Budapest.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

A Baroque mansion with ties to legendary magicians and alchemists.

This bank is widely believed to be the inspiration for the offices of Philip Marlowe, the hardboiled detective featured in a number of Raymond Chandler's stories.

On Waikīkī Beach, a monument to four extraordinary individuals of dual male and female spirits who brought the healing arts from Tahiti to Hawai'i.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

This pair of gilded girls atop an Art Deco building in Copenhagen were built to function as a weather indicator.

This unique bed and breakfast was first constructed during the 1800s by a Russian immigrant family.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

A diminutive statue that was inspired by the sculptor's own daughter.

In the "Danish Capital of America," a replica of one of Copenhagen's most iconic buildings.

Explore more than 130,000 new and used books in the "world's largest outdoor bookstore."

A couple turned their front yard into an artistic masterpiece.

Hawai'i's oldest wooden house was shipped around Cape Horn from Boston in 1820.

A glass display case holds the document that ended the Second World War—which one person signed on the wrong line.

Although now a decaying ruin, this stone cabin's history includes several notable figures.

Made famous by 'Star Wars,' these troglodyte homes face an uncertain future.