A fine, large-aperture telescope available for public use.

It houses the remains of a 17th-century version of the Titanic.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

The world's largest model of our planetary system.

The internet as provided by a James Bond villain.

The single richest source of elemental discoveries in the world.

Early habitat dioramas and home of the elusive gaff, the skvader.

The fossilized remains of ancient California redwoods.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

The only road through the heart of Glacier National Park.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The first declared National Monument in the United States.

A US military accident created the legends behind this Mexican version of the Bermuda Triangle.

Tour the original street level of Port Angeles, buried underground in 1914.

Cave carved out of a huge snow drift collapsed killing one and injuring five in July 2015.

Mining town from the late 1890s, once home to Calamity Jane.

Local legend has it that an old, decaying staircase outside this cemetery is haunted by dozens of ghosts.

A cave interior in the shape of the ancient rhinoceros, created by lava cooling around its carcass.

A time-capsule monument reminding future generations of the importance of efficient and effective use of natural resources.

Marvel of green building techniques that sings with the wind.

Native American burial mounds? Giant gopher dens? No one knows what created the Mima Mounds.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

An abandoned movie set in the desert of West Texas.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.