A priceless collection of the Nation's cryptologic history.

The haunting ruins of Jack London's dream house.

The world's largest military aircraft cemetery.

A museum dedicated to the history and exploration of both popular music and science fiction.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Home to items never before seen by the public.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Two thousand artifacts from around the world collected by one woman who loved to travel.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

This massive library holds what was once the largest book collection in the world.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A semi-scholarly approach to sex.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The glowing blue Nymphaeum of Emperor Tiberius.

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

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The rusting remains of the largest assembled WWII fleet on the West Coast.

Rustic natural hot springs in the deciduous rain forest.

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

San Francisco's newly reopened hands-on science museum.

Eccentric concrete mansion and museum designed and built by hand from the inside out.