Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

The world's only museum devoted to the wonders of fluorescence.

Museum preserving torture methods from the past.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

The largest copper mine in Arizona, this enormous open pit emerges from the hills like an alien landscape.

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

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

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

America's only nuclear missile silo open to the public.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

Dramatic river bend surrounds a natural red-rocked pedestal.

Rippling sand dunes frozen in the Arizona rock.

This towering volcanic plug stands out among the dramatic formations that dot this otherworldly desert valley.

This highest peak in New Mexico is named after an explorer who had a habit of lending his monicker to peaks.

A unique geological area spiked with wind-carved rocks that resemble teepees.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

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

The highest point in Texas is capped by a big silver pyramid.

Natural catch-basin rocks covered in thousands of drawings spanning many millennia.

The Grand Canyon of Texas.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."