This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

A city continually buried under the ash of a volcano that has been erupting for more than 15 years.

A sharply wedged sundial marks the point at which each day in the United States begins.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

The world's smallest drawbridge.

A museum dedicated to man's boldest venture.

Where the author wrote her beloved "Little House" books.

Elvis's own personal tropical hideaway.

The bad-ass ride of a soul legend, housed in one of the world's few soul museums.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

Small teepee-like houses built for TB patients have become sheds, studios, and bus stops around Colorado Springs.

Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

A number of gruesome unsolved murders have turned this simple home into a morbid tourist trap.

A house turned museum is the real-life "home" of the fictional main character of The Wizard of Oz.

An Englishman loses his scalp to a Cheyenne warrior and lives to donate it to a library.

See six states, pickled freaks, rocks, and antiques.

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

This replica small town lets visitors take a stroll through the story of progress in the U.S. via thousands of Americana artifacts.

This free, take-a-book shop seems like a trick but isn't.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

This Great Depression-era creation was once known as the strangest house in the world.