An unnatural lake in a naturally beautiful setting.

This impressive tunnel was dug entirely by hand over the course of 36 years.

Tour the sci-fi-esque reality of governmental disease management.

These otherworldly limestone formations jut out from the Kansas prairie.

The oldest bar in Missouri is hidden within a limestone brewery cellar more than 50 feet underground.

Why settle for barbecue chips when you can get actual barbecue?

A whimsical monument marks the highest point in Kansas, not that you could tell by the looks of it.

Curious rock formations in a tiny Kansas state park.

A trash dump made beautiful by nature's power.

Celebrating the transformation of trash into objects of beauty.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

Olfactory delights in San Francisco's Botanical Gardens.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

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

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A winding path built in secret on the edge of the continent.

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

A psychedelic labyrinth on the San Francisco bay.

A huge musical instrument played by the ocean.

The blowhole bursts spectacularly right next to the buildings in a medieval seaside town.

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

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