Giftshop catering to cryptozoologists and anyone with a sense of humor.

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

Obscure Freemasons still live in D.C.’s largest private residence.

This grand gothic brewery has been pumping out suds for over a hundred years.

One of the oldest train stations still standing in Virginia played a vital role during the Civil War.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

A celebrity from the late Cretaceous period.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

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

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

A giant time capsule not scheduled to be cored until 2040.

This suburban park recalls the history of a famous tavern. Despite the name, it's no ordinary place!

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

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

Using a massive antenna made up of five miles of wire, two scientists tuned into organic radio waves from the planet Jupiter.

The hidden ruins of a mill that is linked to an attempt to assassinate the vice president of the United States.

This general store is more than a century old and home to various oddities and antiques.

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

The smallest covered bridge in Maryland.

Unannounced visitors are now welcome at the site of the largest Prohibition-era bootlegging operation in the region.