Where a staggering 747 ships were constructed during World War II.

Its dark depths conceal millions of rare, delicate crystal formations.

The long, arduous journey of the stones of the Abbey of New Clairvaux.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

Abandoned Air Force base that has fallen into disrepair.

Russian history in San Francisco.

An abandoned, unfinished mansion on grounds strewn with lava rocks.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.

A popular tourist cave with a dark past.

The hotel room where Janis Joplin tragically died has now become a makeshift shrine to the singer.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

Commonly referred to as the most photographed Victorian home in the United States.

Stroll the grounds built by murder, suicide, and dirty oil money at one of Hollywood's most filmed mansions.

One of the last free public hot springs is decorated with hippie art.

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

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

The site of murders and Satanic cult gatherings.

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

Travelers exchange letters with woodland creatures at this mini post office.

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.