This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

The real-life site of Ichabod Crane's infamous gourd attack.

Home to the abandoned Tioronda Hat Works Factory, this park is a combination of woodlands and marshlands.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

Of all the unique artifacts inside this library, a mummified hand stands out among the others.

A mysterious echo seems to defy the laws of acoustics.

The oldest standing structure in downtown San Diego.

North America's largest accredited model railroad museum.

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

San Diego's most historic and haunted home.

These two K-9 memorials commemorate the sister cities of Edinburgh and San Diego.

This historic graveyard was partially paved over to create a streetcar line.

This small-town pizzeria won the Hollywood lottery.

The flagship building of an early national restaurant chain is a superb example of terra cotta art.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This plaza is home to a number of works, including Montpellier‘s own Arc de Triomphe.