A huge musical instrument played by the ocean.

A museum dedicated to the exploring past, present, and future innovations.

A medical facility that has been kept frozen in time.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

As communication goes completely wireless, this Maine museum remembers all the wires that got us to this point.

The longest navigable underground river in the United States is home to countless blind and albino animals.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A wild west land agreement was etched right onto this historic Idaho stone.

Moonbows over Kentucky.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

These powerful, if squat, Canadian waterfalls flow in different directions depending on the time of day.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

A beautiful geyser under environmental threat.

Rustic natural hot springs in the deciduous rain forest.

Hollowed out cedar log tubs set in an ancient towering forest.

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

The highest peak in Utah is the hardest to reach, but only if explorers choose the hard way.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.