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

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

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

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

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

A strange house built only at night, with rumored mystic inspiration.

A hand-built folk art installation covered with messages of God's love.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

The ghostly remains of an accidental sea.

The rocks in this arid basin leave trails of movement behind them.

A trash dump made beautiful by nature's power.

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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

An inconspicuous footbridge beloved by San Diego locals.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

Explore 10 acres of environmental sculptures.

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

An overlooked and unassuming engineering marvel.