A huge musical instrument played by the ocean.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

This subtle Berkeley paving stone actually marks off a lawless tube of air that extends into space.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

A museum devoted entirely to the rattlesnakes and snake-related art.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

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

This is one really big nut.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

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

A museum dedicated to the alleged Roswell Incident.

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

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

These experimental weapons brought World War II to Nebraska as well as 26 other U.S. states.

These former Cold War launch sites have been preserved for tourists to see where the button might have been pushed.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

The first attack on the continental U.S. during WWII occurred off the coast of a quiet California golf course.

This sky-high radio mast is formerly the tallest man-made structure in the world.

The remnants of an early American attempt at missile defense.

The final resting place of the Emperor of the United States and Protector of Mexico.