This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

After hundreds of years of settlement, this once-bustling fishing village sunk into the Chesapeake Bay.

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

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

The land is home to swimming ponies and a legendary 18th-century treasure.

An eerie, decaying ghost town destined to fade into the forest.

The trials and tribulations of marking Poe's grave.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

The uniquely-designed winter home and sculpture studio of Anna and Archer Huntington.