Concrete strongholds stand guard over the Golden Gate.

"Polynesia on the Plains."

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

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

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

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.