This simple, broken column marks the final resting place of one of America's most famous explorers.

Elvis's own personal tropical hideaway.

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

The Bucyrus-Erie model 1850B electric shovel, or "Big Brutus," the largest existing electric shovel in the world.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

Massive still life just off the highway in Kansas.

The United States's largest hand-dug well is topped with a state-of-the-art museum.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A vaudeville performer mounted this hollowed-out redwood log onto the chassis of a truck, and toured the country spreading a message of conservation.

The world-record holder for the longest bridge stretching continuously over water.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

Where manatees are the snowbird vacationers in these balmy Florida springs.

A monument celebrating the idea of reaching inaccessible places.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

Interactive modern and vintage submarine equipment, World War II relics, and submarine attire.

Dubbed the "smallest church in America," this tiny sanctuary was a local grocer's dream come true.

When ecosystems collide in the arid Southwest.

The highest bridge in America was built for an almost unnervingly small amount of money.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Inside this striking glass building, visitors can see thousands of dinosaur fossils in the positions that nature deposited them more than 150 million years ago.

A stoic rock cairn is all that remains to remember one of the more brutal instances of frontier treachery in American history.

The unusual patterns in this rock formation result from two distinct modes of weathering.

A tunnel with windows, so you don't miss out on the impressive views.