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

The flow from this waterfall sometimes comes out of springs below its rim.

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

“It's the quality” (but probably also the drive-through donut tunnel) that has attracted diners since 1968.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

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

A common entry point to the Griffith Observatory trail holds its own wonders.

The quiet canyon has a tumultuous history involving a doomsday cult.

This ultra-modern home clings to the slope of the Hollywood Hills on a precarious stilt.

The neighborhood shop is a sort of tiny cactus museum full of exotic specimens you can take home.

This glamorous old building is said to have inspired the Tower of Terror.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

A museum dedicated to the dead and the tools used to usher them into the afterlife.

A beautiful collection of architectural ornaments rescued from demolished New York City buildings.

A curious friendship between two inanimate ladies.

The painter who popularized "bulls" and "bears" as symbols for the stock market didn't get a proper headstone for over a century.

One of only two remaining Victorian-era greenhouses in New York.

A modern zoetrope on the New York City subway.

Brooklyn's most iconic restaurant, resurrected.

A library of rare occult books in Los Angeles.

This star-studded Old Hollywood restaurant is where fettuccine Alfredo made its United States debut.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

An exotic wildlife habitat right off The Strip.