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

These massive concrete balls were used to mine gold in Virginia.

Washed out by the Johnstown Flood in 1889, the surviving portion of the original two-span bridge now resides at Fishing Creek.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

At this former Prohibition speakeasy, electric birds signaled the arrival of hooch.

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

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

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

The FBI's urban training course may have the highest fake crime rate in the world.

Where pardoned turkeys once spent their all-too-brief final days.

This field of concrete was once an active defense site armed with nuclear warheads.

A lone historical marker off the highway and scattered debris are all that remain of this Cold War-era missile site.

The only place for a truly presidential dram.

This massive swimming pool is the high tech home to the human-powered submarine races.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

FDR's Art Deco hospital tower was hopelessly inefficient.

Built to defend Washington D.C. during the Civil War, this fort became a post-war nucleus for a thriving Black community.

The United States Capitol's former columns still stand.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

The school tested mustard gas for the U.S. Army during World War I.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.