This lovely pocket park is one of the most under appreciated in D.C.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

The oldest continuously operating fish market in the United States.

A derelict bit of transportation infrastructure hidden in the woods.

A wondrous old library overlooking the nation's capital.

An isolated island home to one of the oldest English-speaking communities in the region and Maryland's state dessert.

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

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

A hidden alley in urban Baltimore is a haven for graffiti artists.

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