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

This deceptively beautiful island was once home to a German concentration camp and known as "Death Island."

An innovative attempt to break a siege in the American Civil War still scars the earth today.

Colombia’s only monument erected to mark the end of slavery in the former Republic of New Granada.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

In medieval times this small stone seat was used as a bizarre way to punish insolvent debtors.

A series of 33 stone markers maps an ancient 55-mile transportation route.

Alaska Natives have lived on this tiny isolated island in the Bering Strait for over 5,000 years.

Near the ruins of a Civil War coastal fortress lies the only known African refugee cemetery in the United States.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

A historical home in upstate New York honors the work of John W. Jones, a formerly enslaved man who was a major agent for the Underground Railroad.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

The airport was once a Civil War battleground, and the earthwork defenses can still be seen today.

This tiny, tranquil Senegalese island serves as a powerful symbol of the Atlantic slave trade.

This resort community was known as the "Black Eden of Michigan."

This edible park is open to any and all foragers.

Colloquially known as "the lynching memorial," this is the United States' first memorial to the victims of racial terror at home.

These colonial murals are a fascinating hybrid of Spanish and Indigenous aesthetics.

A mountain range on an active U.S. Navy base hides thousands of mysterious prehistoric rock carvings.

This somber statue remembers the enslaved women who were forced to nurse their owners' babies.

Its 27 graveyards represent the many nationalities and ethnic groups that voyaged to this wilderness in the late 19th century.

A soon-to-be-forgotten roadside spectacle loaded with local lore.

A somber monument commemorates the site of a Native American reservation marked by suffering.