This tiny patch of arid sand sits in one of the greenest states in the United States.

The first bridge observation tower in the U.S. offers one of the best views of Maine.

Every plane, auto, and bicycle in this collection is kept in working order and are regularly demonstrated to the public.

This kitsch eatery is chock-a-block with bric-a-brac.

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

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Public works and national defense project meant to carve a canal all the way across the state of Florida.

The world's largest private aircraft collection.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

A building so large that it has its own weather.

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

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

The third tallest lighthouse in America once guided author Stephen Crane to safety.

A vast array of tropical plants collected by a vacationing couple.

The culprit who accidentally lit this 3,500-year-old tree on fire stated "I can't believe I burned down a tree older than Jesus."

Minnesota's oldest and deepest mine is now an underground physics laboratory.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

When ecosystems collide in the arid Southwest.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

Natural sonic phenomenon comes with a grisly legend of murder and blood.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

Home of the International Space Hall of Fame.