This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

This majestic tree has survived 400 years of storms, droughts, and floods, and is a beloved natural landmark in Missouri.

This mosaic-covered bar is brimming with curated curios.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

A recreated Stonehenge stands in a country field, complete with Easter Island moai heads standing as sentries.

The summer home of the largest colony of bats in the world.

This beautiful grotto is one of those places where you can't believe you're just outside Austin.

No one is sure why this mysterious tradition started.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

An emerald-green grotto just a short trip from Austin.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

Celebrating the transformation of trash into objects of beauty.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Hidden in the hills of Hollywood, this secluded Oz-themed garden is dotted with dozens of thrones.

America's most famous piece of self-built architecture.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A huge musical instrument played by the ocean.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

Bizarre and inspired combination store selling only two items: tires and bibles.