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

A Civil War Museum with some notable medical antiques.

The 320-year-old tree that greeted General Lafayette and rerouted an interstate highway.

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.

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

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

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

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

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

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

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

A priceless collection of the Nation's cryptologic history.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

The land is home to swimming ponies and a legendary 18th-century treasure.

Wedged between two sets of row houses is an awkwardly located family graveyard.

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

One of the oldest anatomical theaters in the U.S. still in use was once the site of an infamous cadaver riot.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

Meet some of the most prominent figures in Black history through life-sized wax models.

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.

Ship skeletons haunt Baltimore's waterways.