A large lava tube that can be walked through with no special equipment.

The first radio telescope dedicated to the Search for Extraterrestrial Intelligence.

A whimsical display of massive metal sculptures made from recycled materials.

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

An optical illusion found amid a logged redwood forest.

This massive redwood tree has a hole in the base big enough to drive through.

A trash dump made beautiful by nature's power.

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

A large sculptural artwork and garden in Escondido, California.

This mother-daughter run curiosities shop is a beautifully odd mix of taxidermy and exotic plants.

An eccentric millionaire's personal curio collection includes at least one shrunken head.

At the edge of the high desert, California's second-largest natural lake is home to a unique subspecies of trout adapted to its alkaline waters.

The flow from this waterfall sometimes comes out of springs below its rim.