A mysterious light floating in the trees of Arkansas may be a piezoelectric effect.

Local legend says that someone is buried in the trunk.

Town not known for anything except its strange name.

An emerald-green grotto just a short trip from Austin.

The world's largest military aircraft cemetery.

America's only nuclear missile silo open to the public.

One of the largest open-pit copper mining operations in the entire country.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The world's first time capsule lies behind a welded steel door in Atlanta.

A simple Colonial home with a past haunted by death and madness.

The site of one of history's most indelible and horrific tragedies.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

Siberian husky that delivered a life-saving antitoxin.

An auroral research program that superheats the ionosphere.

Permanent exhibit reminds visitors of the Exxon Valdez.

A monument to the center of the North American continent may be off by a few miles.

Try not to get slimed in Tribeca.

A real (but thankfully not live) missile stands tall as a monument to the United States military in the small town of Cordele.

Fantastically decorated underground chambers built in the 1760s.

Small-town museum dedicated to outer space ... and bicycles.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

The Connecticut village named for its subterranean thunder.

Acres of natural wonders left behind by a socialite-turned-gardener.

A man-made island in scenic San Francisco Bay.