A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The underground sanctuary of a mysterious ancient cult.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

This abandoned amusement park was built on a site with a dark history.

An otherwise quiet campground becomes a bustling medieval town for two weeks every year.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

This permanent exhibition celebrates the finest of our heartless automatons both real and fictional.

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

This massive boulder is either a unique rock formation created by glacial melt or a magic energy vortex.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

A model home in the Medical Examiner's Office in which grisly death scenes are staged to train forensic investigators.

Eighteen miniature death-scene dioramas.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

A Civil War Museum with some notable medical antiques.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

A macabre farm reserved part of its 222-acres for dead bodies, all in the name of science.

This colonial mansion has been home to a staggering number of American historic figures.

Waterway populated with abandoned projects, including a submarine.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

The oldest farmer's market in America is so ancient it was approved by the King of England.

The first of Lancaster's "rural cemeteries."