This shallow cave got its name from copious amount of human bones found inside.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

The unbelievably opulent home built for an infamous newspaperman.

A spiritual vortex among the red rocks in Sedona.

See massive fossils that are over 200 million years old in northeastern Arizona.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

The Old Mill shown in the opening credits of “Gone With the Wind” is actually fairly new, and was never a mill at all.

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

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

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

The eccentric mansion of one the most popular horror authors of modern times.

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

Quite simply the largest tree in the world (by volume).

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The only surviving prototype for Buckminster Fuller's house of the future.

World's largest Christmas store.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

A Circus legend leaves an unexpected endowment.