A 100-foot metal tower and swinging bridge that provides stunning views of mountains in five states.

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

The only surviving 19th-century water-powered mill found in the Washington, D.C. area.

The only museum outside of Australia dedicated to exhibiting the artwork of Indigenous Australian artists.

The system of air guns are fired off remotely to scare any trespassing avians.

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

This abandoned church languishing for decades is now one man's passion project and subject of paranormal investigators.

This homestead was occupied by Union soldiers, who believed the owners were signaling Confederate forces.

Country fans may flock to Nashville's music scene, but this Appalachian town is where the genre was born.

The most historic church in Fairfax County played a role in the creation of the American Red Cross.

A lightship turned museum, outfitted with artifacts from the vessel's past as part of the U.S. Lighthouse Service.

A home that witnessed Civil War combat on the Sunken Road has the battle scars to prove it.

This monument is dedicated to those lost on June 6, 1944, in the town with that day’s highest per-capita casualty rate.

At Brandy Station, Civil War soldiers left their mark on the battlefield and the walls of this small wooden house.

This estate on the banks of the James River was home to a Founding Father, two presidents, a famous bugle melody, and what some say was the actual first Thanksgiving.

A 14-foot monument marks the resting place of two of the town's earliest residents—and one unknown soldier.

The grave of a champion Thoroughbred hides within the former presidential estate.

Once the largest trading firm of enslaved people in the U.S., this building is now a museum that preserves Alexandria's dark past.

Get up close and personal at this Fresnel Lens.

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

Please don’t anchor your boat onto the Department of Defense’s underwater data cables.

This former Cold War missile control site played an important role in the creation of GPS.

Born a slave on the Arlington estate, Parks dug the first graves at Arlington National Cemetery, and was buried there, too.

A memorial dedicated to a highly decorated Marine and Korean War veteran, who also happened to be a horse.