Every equinox this Maya pyramid puts on a spooky ancient light show.

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

Before Nixon, "watergate" meant canals.

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

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

A Memphis park where you can walk the whole Mississippi River in one go.

Yo, Adrian!

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

With nickel-steel armor and three-inch thick bullet resistant windows, FDR's train was a rolling fortress.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world’s largest coastal brick fortresses.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Lie in a hammock where George Washington stood.

A building so large that it has its own weather.

Steepest flood safety railway in the entire world.

Memorializing an American tragedy of massive proportions.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Once America's longest-manned military fort, now an abandoned hulk.

Oldest synagogue in the United States.

Experience a charming 1930s version of "infotainment."