A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

On the Oregon coast there is a natural hole that seems to be draining the sea.

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

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

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

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

This historic general store still operates much as it did in the late 1800s.

A 90-year-old underground water reservoir offers a more industrial kind of tranquility.

This seaworthy collection was sparked by one man's passion for sailing.

A private collection of massive steel monsters guarding a Texas pipe works.

This small hut in the middle of a parking lot was once the wooded sanctuary of the 'Hermit of Montrose.'

A miniature city built by a single hunchbacked monk.

The highest point in Alabama was almost completely deforested, but is now home to protected towers and trees.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

Famous for its bio-luminescent inhabitants, known as "Dismalites" .

Orr Park's dead trees have been carved into a menagerie of whimsical visages.

A natural history museum with an extensive collection of bird dioramas.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

148 feet long and in the middle of a verdant forest.

A bizarre roadside attraction and the first instance of miniature golf in the world.

More than five miles of underground passageways.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

A humid oasis combines recreation with exploration in a unique underwater cavern.