During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

A priceless collection of the Nation's cryptologic history.

Ship skeletons haunt Baltimore's waterways.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

A collection of artifacts from Maryland's maritime past.

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

America's first nuclear-powered merchant ship is now a time warp to the atomic age.

It may appear to be a fancy junk yard, but each item has a story to tell and a lesson to impart.

The district's only illusionarium supports free writing programs for local students with every purchase.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

Its diverse collection of computers and technology spans the ages.

The development and impact of electronic media showcased in a picturesque farmhouse in Maryland.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

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

An abandoned church gets a second life as a massive beer hall and event space.

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

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

A remarkable time capsule of American manufacturing deep in Maryland coal country.

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

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

This abandoned sea fort has become an accidental bird sanctuary.

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

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