The first memorial dedicated solely to the Black troops who fought for the Union.

People escaping slavery may have hidden inside a corpse vault.

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

A painfully obvious spy house sits right across the street from the Russian Embassy.

Home to items never before seen by the public.

The United States Capitol's former columns still stand.

Steepest flood safety railway in the entire world.

This Native American petroglyph marks the location of an important, Creek trail.

After being inoperative for over half a century, this elaborate fountain in Atlanta's oldest park was restored to its former glory.

Rare and classic books by Black authors are the focus at this independent bookstore in a historic Atlanta neighborhood.

Located on the campus of Emory University, this museum is filled with objects from the Americas to ancient Greece.

Beside some power panels, a plaque celebrates the history of an alternate world.

This small cemetery is all that remains of Atlanta's first Black communities.

Healing Springs that once ran red with soldiers' blood.

Dedicated to a synagogue that was destroyed after having survived World War II.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This stone complex marks the urban center of a lost civilization.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

This bullring in Lima is the oldest in the Americas and the second-oldest in the world.

The elaborate crypt where Peruvian heroes of the War of the Pacific were laid to rest.

The large collection of pre-Columbian pottery might make you blush.

Now containing the bones of the actual conquistador, instead of someone else.

China's biggest e-waste village.

The ruins of what is considered the world's oldest university.