Visitors come from all over to bring gifts and tokens to the grave of Alice, who is thought to have died of a broken heart.

Decades before the scandal, this staircase on the river was a literal "water gate."

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

An overlooked memorial honoring the local Washington residents who died in World War I.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

The secret wartime bunker built on the platforms of an abandoned Tube station.

This underpass became an unlikely piece of cinematic history after its appearance in 'A Clockwork Orange.'

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

This strange statue features a bust of the famous composer plopped atop a woman's body.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

This 19th century cyclorama acts like an analogue time machine to a different era.

The medieval network of canals hidden underneath the city is opened to explorers each year.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.