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

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

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

The world’s first penitentiary, meant to be humane, drove men insane.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Art deco landmark on the outskirts of Washington, D.C.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

An astounding collection of medical specimens, including bits of President Lincoln.

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

The site of the climactic scene from the classic horror film is now a historic landmark.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

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

At 207 feet, one of the world's longest continuous escalators.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Macabre astrological automaton clock dating to the late 1400s.