These unusual rooms on wheels are holdovers from the 1960s.

America's second-oldest brick baseball stadium was home to a legendary WWII series that only sailors got to see.

The childhood home of the famous general's mother is now a small, walled garden.

This cannonball stands as a reminder of the final act of a fleeting governor amidst a revolution.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

The narrowest house in America is seven feet of pure spite.

Take an otherworldly journey in a school dedicated to out-of-body experiences.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

Rowdy rebels fortified this home during the first popular uprising in United States history.

Bigfoot prints, Feejee mermaids, and haunted dolls on display in a tiny North Carolina town.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

A former major munitions plant that has been converted into a sprawling art space.

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

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

A derelict bit of transportation infrastructure hidden in the woods.

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

The "lovely red Vega" of the legendary record-settling pilot.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.