A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

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

A Bibliophile's Dream.

The world's longest known cave system.

According to one local tradition, the entrance to the Voodoo underworld can be found in New Orleans through seven gates scattered throughout the city's French Quarter.

Take a drunken tour inside the world's largest known geode.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

A museum dedicated to the history and exploration of both popular music and science fiction.

A hip bar decorated with walls of golden skulls.

An emporium for the weird, creepy, rare, and just plain gross.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

The curiosities and wonders of pharmacy in a delightful historic building.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

Two thousand artifacts from around the world collected by one woman who loved to travel.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

A speakeasy takes on Chicago's drinking culture.