The highest point in Louisiana, Driskill Mountain at 535 feet above sea level.

"X" marks the spot of an echo chamber in the middle of a plaza.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

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

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The "lovely red Vega" of the legendary record-settling pilot.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

Decades before the scandal, this staircase on the river was a literal "water gate."

At 207 feet, one of the world's longest continuous escalators.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

Andy Griffith's hometown has made itself up to look like the fictional town of Mayberry.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

A bizarre roadside attraction and the first instance of miniature golf in the world.

This replica of the Greek structure is in the heart of Nashville.

Famous for its bio-luminescent inhabitants, known as "dismalites."

A miniature city built by a single hunchbacked monk.