The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

The former home of the man whose radical ideas changed the nation.

Giant busts of 42 U.S. presidents sit, crumbling in a field in Virginia.

Home of the only civilian casualty at the Battle of Gettysburg.

The beloved, war-tested mascot of a Union regiment graces their battlefield monument.

A diorama of the Civil War, fought by cats.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A museum dedicated to the alleged Roswell Incident.

This abstract roadside poultry was saved from demolition by outraged drivers and pilots.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A house carved into a rock in the 1940s.