This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

Need a hardcopy of the 50-title Code of Federal Regulations? This is the place.

Look closely and you’ll notice that the color changes a third of the way up the tower.

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

A portal into the bricked up canal that runs through the heart of Washington D.C.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

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

The national park was once a plantation estate.

It was once the base for a series of domestic terror attacks.

A historic neighborhood church is reborn as a psychedelic arts collective.

This sun-scorched lakebed contains samples of half the natural elements known to humankind.

The abandoned train depot now doubles as a well-placed rest stop for those who take the road less traveled.

The most isolated mailbox in America lets desert travelers record their passing.

Where NASA's satellites and rovers phone home.

This unlicensed collection of fast-food memorabilia sits on the site of the first ever McDonald's restaurant.

A former utopian healing center created by a huckster and built by derelicts.

The world's largest fire hydrant is supposedly tornado-proof.

This titanic steel chain linking two buildings was installed without permission but instantly beloved.

This psychedelic tromp l'oeil seems to be beckoning drivers to crash into a wall.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

All that's left of the quintessential "cabin in the woods."