Quite simply the largest tree in the world (by volume).

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

Towering basalt columns, a creation of fire and ice.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

Shop selling 500 flavors of soda has something for everyone.

The ghostly remains of an accidental sea.

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

A winding path built in secret on the edge of the continent.

A walk through the historic city center, under the streets of Seattle.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

A one-of-a-kind collection of a unique medium.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

Try not to get slimed in Tribeca.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

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

Dramatic river bend surrounds a natural red-rocked pedestal.

A 140-year-old castle with underground caves hidden in San Francisco.