Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

Historic home of America's sweetheart sharpshooter, Annie Oakley.

Two dozen pinball games hidden away inside a most unlikely location.

Electronic inventions that resulted in products and systems we use every day are on display in this labor-of-love museum.

Remains of a historic fountain that was mysteriously lost in the demolition of a D.C. traffic circle.

The antique hotel still has a jail in the basement, though the cockfighting ring is long gone.

Once America's tallest structure, now a Baltimore landmark.

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

This former asylum for Black Americans is haunted by its history of violence and racism.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

Built by the patriotic residents of Boonsboro in a single day.

Ship skeletons haunt Baltimore's waterways.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

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

This abandoned sea fort has become an accidental bird sanctuary.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

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

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

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.