At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

A century-old network of freight tunnels underneath the city's historic business district.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

An antiquated German apothecary on Chicago's North Side.

Locals dubbed this abandoned abode the "gingerbread house" because of its odd architecture.

More than five miles of underground passageways.

Alabama has a fiberglass Stonehenge. With apologies to Spinal Tap, this one is full-size.

The above-ground crypts at this Catholic cemetery face north-south instead of the usual east-west.

Legend says a primate-like cryptid prowls this otherworldy sliver of the Louisiana bayou.

Pirates had to be ousted from the land where this now ruined Louisiana fortress was built.

Beautiful waterfalls grace a canyon visibly torn by a violent tornado.

You can climb to the summit of Black Mountain, as long as you sign the waiver.

A Rodeo for Prisoners.

The crumbling ruins of this southern American fort have survived storms, war, and cults.

A haunting, yet lovingly hand-hewn potters' field full of graves that flood with each heavy rain.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

An enormous natural sandstone bridge in Kentucky.

Outstanding collection of 19th century medical instruments includes a life-size figure cast from as many as 200 cadavers.

After the parade, students throw their beads on the tree hoping for good luck on exams.

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.

The only rotating bar in New Orleans has been slowly spinning since 1949.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

A 19th-century shrine covered with prosthetic body parts as votive offerings.