100 massive sculptures in the Hudson River Valley.

A place to eat for on-the-run agents and espionage enthusiasts.

This striking art museum holds an amazing series of curiosity cabinets.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

A unique set of caves that spits waves back out into the ocean.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

A slice of central Asia in the middle of Berlin.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

The site of a fallen tree that protected Americans from British forces during the American Revolution.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

A Collegiate Gothic quadrangle that surrounds an 18th century secondary school whose financing came from the likes of Alexander Hamilton and Aaron Burr, among others.

These century-old townhouses contain some of the first car garages built in the United States.

Avoid gangster interaction while window-shopping.

An artist's cute bronze subway sculptures belie his violent artistic past.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

Lie in a hammock where George Washington stood.