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

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

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

Remnants of a storybook amusement park hidden behind a strip mall.

This abandoned sea fort has become an accidental bird sanctuary.

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

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

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

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

A priceless collection of the Nation's cryptologic history.

A remote horde of architectural treasures fit for Indiana Jones.

Ship skeletons haunt Baltimore's waterways.

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