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

The biggest solar telescope in the world helps reveal the secrets of our sun.

One of the largest open-pit copper mining operations in the entire country.

The world's largest military aircraft cemetery.

An homage to everyone's favorite prehistoric cartoon family.

One of the world's largest telescopes, stares into the night sky with two huge mirrors.

A reproduction of earth's many biomes.

See massive fossils that are over 200 million years old in northeastern Arizona.

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

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

A motel dedicated to Southwestern nostalgia.

A geological mystery on Camelback Mountain.

An urban laboratory.

The world's second largest single-dish radio telescope, once used to contact E.T.

A monument celebrating the idea of reaching inaccessible places.

"We Seceded Where Others Failed."

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

A building so large that it has its own weather.

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

A haunted hill that supposedly defied gravity.

Once one of the largest producers of pig iron in the world.

A mysterious castle built as a monument to lost love.

Former villa and estate of James Deering developed to preserve native tropical forests.

The world's largest vertical wind tunnel.