San Francisco's oldest surviving monument and meeting place for 1906 survivors.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A tunnel with windows, so you don't miss out on the impressive views.

A 19th-century cabin built into a hollowed-out Sequoia tree.

Thousands of migrating monarchs overwinter clustered amongst the eucalyptus trees.

The abandoned personal amusement park of the King of Pop.

A hotel and restaurant serving as the mecca of kitsch.

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

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

North America's largest accredited model railroad museum.

Hidden in the Santa Ynez Mountains off Highway 154, this tiny restaurant once served as a stagecoach stop.

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

Amazingly detailed marble cinerary urns that once held the cremains of Roman elite.

The upstairs reading room is packed with millions of rare books, literary manuscripts, and historical treasures.

A chain of bells connect the California Missions and honor the legend of the "King’s Highway."

An alley covered with 20 years of bubble gum.

Few other hotels can rival the grandeur of the Castle in the Rockies.

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

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

The Virginia home of one of the signers of the Declaration of Independence is being preserved with a unique glass facade.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

These boots are made for selfies.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.