Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

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

Sniff the Titan Arum's rotting flesh.

This charmingly homemade amusement park has been growing for 40 years.

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

This Los Angeles animation studio is keeping the wonder of stop motion puppetry alive.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

The trials and tribulations of marking Poe's grave.

A reproduction of earth's many biomes.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

This lab's maddening silence is good for business but bad for sanity.

The largest earthwork effigy in the world.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

The angel of death appears to weep black tears at this grave marker.

An acoustic anomaly with a mysterious cause.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

A prohibition-style speakeasy takes up residence in the last Victorian residence in Hollywood.

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