This former coal gasification plant found a curious second life as a popular public park.

A modern mechanical planetary system, part of a 10,000 year clock.

An extraordinary mixture of natural beauty and man-made phenomena.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

Visit this playground of waterfalls, caves and sinkholes.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

A "Titanic" superfan changed his name to Jack and set up this strange shrine to the blockbuster, complete with Korean food and Tarot readings.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

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

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

This home is decked out like a psychedelic explosion of colors and bowling balls.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

A house carved into a rock in the 1940s.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

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