A towering monument to war, located on a beautifully peaceful hill.

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

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

A flower grows on this giant stone that is said be able to control minds.

At first glance, little checkered structures on the hillside look like they house the living, not the dead.

A stone circle on the slopes of a Caribbean volcano commemorates the leader of an anti-slavery uprising.

Three small rooms in the jungle house the most elaborate and intact murals of the Mayan world.

This extraordinary art museum is like a secret world on the edge of Mexico City.

The Acropolis of this little-visited Mayan archaeological site offers great views of Chiapas’s Lake District.

A flooded Mexican cave that hides a river beneath the water.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

Still standing despite its considerable slant, this tilted lighthouse has become a local symbol of resilience.

Few of the many visitors to this resort town know of its hidden Maya ruins.

A line of blue paint marks the route of the inaugural parade.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

More than 500 unique and specially designed cases collected by D.C.'s "Harmonica Case Man."

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

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

These abandoned waterworks are crumbling into the Potomac River.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

The elevator that makes it possible to fly American flags in bulk over the U.S. Capitol

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.