A sculptor's dream castle turned fantastical ruin.

An innovative attempt to break a siege in the American Civil War still scars the earth today.

A home built with marble tombstones from the graves of 2,200 Union soldiers buried in a Virginia cemetery.

This collection of over 50 classic pinball machines awaits visitors to downtown Roanoke.

Bigfoot prints, Feejee mermaids, and haunted dolls on display in a tiny North Carolina town.

A unique set of caves that spits waves back out into the ocean.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

Hiding in plane sight.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

This former fire tower is now a rustic observatory that offers amazing views of eagles, hawks, and the Appalachian Mountains.

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

The oldest arched-covered bridge in Virginia has truly withstood the test of time.

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

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

A world-class observatory in the California desert.

The world's largest wooden trestle stretches across this desert canyon in Anza-Borrego Desert State Park.

A UFO scrapyard in the California desert.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Only intact Ichthyosaur skeleton in the United States.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

In 1954, two enormous earthquakes occurred just minutes apart, resulting in prominent scarps that extend for miles along the range fronts.