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

This replica of the Greek structure is in the heart of Nashville.

The world's longest known cave system.

Watch the newest land on the planet form before your eyes.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

This black shoreline is made up of exploded lava particles.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

These ancient sacred grounds granted amnesty to those who managed to reach them.

This blowhole is supposedly caused by a trapped monster.

A controversial memorial at the place where Captain Cook met his violent end.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

One of the largest crucifixes in the world stands 55 feet tall in a secluded, wooded area of northern Michigan.

World's largest Christmas store.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Step back in time on this preserved 1800s farm.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

Manatees congregate around a power plant's discharge canal where the water is especially warm.

A luxuriant botanical garden below sea level.

An octet of classic chrome trailers speared into the ground act as a tribute to the silver bullets of the open road.

Electrical pylon in the shape of Disney's beloved mouse.