The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

France's most famous cemetery, with some of its most curious tombs.

This grubby wall is said to be one of the Earth's esoteric energy centers.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Real bones which are said to have belonged to a Polish dragon.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

The trials and tribulations of marking Poe's grave.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

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

Washington's iconic carousel has a nice piece of Civil Rights history.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

Perhaps the most scandalous statue of America's first president.

Largest Roman Catholic church in North America.