Rare recess caves fill this unbelievably beautiful Ohio park.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

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.

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.

Where pardoned turkeys once spent their all-too-brief final days.

These unusual rooms on wheels are holdovers from the 1960s.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

This statue of the "father of television" stands prominently in the United States Capitol.

A cement mixer-turned-kaleidoscope in downtown Norfolk offers different views of the city.

The home of pigs, snakes, chameleons, and the alleged largest bunny in the United States.

This statue is dedicated to Grace Sherwood, the last person in Virginia to be convicted of being a witch.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

Volcanic stone sentinels stand watch at a Korean Bell Garden in Virginia.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

The wooden airship was the largest flying boat ever built.

An ancient Viking village in North America that predates Columbus by 500 years.

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

The evolution of recreational vehicles and motorhomes is on display in the “RV capital of the world."

A lawn full of retired spacecraft on display at one of NASA's first research labs.

This natural wonder is disappearing at an alarming rate.

A historic ruin just 20 feet away from a busy highway onramp.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

The show's fictional Korean medical camp was created in the Santa Monica hills.