This abandoned sea fort has become an accidental bird sanctuary.

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

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

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

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

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

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

Bizarre Cavern.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.