The only castle in North America to ever house European sovereigns.

A museum in the former home of Marxist revolutionary Leon Trotsky.

The turquoise-studded skull of a long-dead Aztec man sits within Mexico City’s Museum of Anthropology.

The Grand Ole Opry's big voice came from a small home in rural Virginia where she was eventually buried.

The birthplace of the Herndon Gas Company.

This bridge uses an inverted bowstring truss and is believed to be the only of its kind in the United States.

This former Indiana quarry has been transformed into a park and SCUBA site where divers can explore the drowned mining equipment.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

After decades of research and rumors, Little Zion Church was proven to be his final resting place.

Though Johnson is not actually buried here, an Atlanta-based band sponsored a headstone for him.

Contrary to popular belief, this memorial does not actually claim to mark the bluesman's grave.

Home of the physician who set the leg of John Wilkes Booth after the Lincoln assassination.

Located at the former Lorton Prison the Lucy Burns Museum tells the story of the 91 year history of the prison including the dark chapter of its involvement in the women's suffrage movement.

One of the oldest train stations still standing in Virginia played a vital role during the Civil War.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

The only place for a truly presidential dram.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

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

FDR's Art Deco hospital tower was hopelessly inefficient.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

An astounding collection of medical specimens, including bits of President Lincoln.

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

Parking garage where Bob Woodward met Watergate source "Deep Throat."