This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

This 19th century granite fortification is one of the most well preserved forts in New England.

The oldest U.S. Government building in California, and it's State Historic Landmark #1.

This municipal playground was co-created by the father of one of the most playful characters ever.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The profile of one ill-fated deacon was emblazoned forever on this church window during the Halifax explosion.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

The United States Capitol's former columns still stand.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

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

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

A field of nothing but boulders which resembles a giant's gravel driveway.

Once the product of an inexplicable gold strike, this ghost town is now home to one man and his love of classic machines.

This dramatic rail curve was once the target of a failed Nazi attack.

This tumultuous Icelandic lava field looks so alien European researchers want to use it as a stand-in for Mars.

The most powerful waterfall in all of Europe.