The final resting place of a space program monolith.

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

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

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

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

One of few lasting examples of the brief octagon craze that developed into folly.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

The remains of a 12th-century chapter house in Golden Gate Park.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

The restored and active Victorian-era final resting place of San Francisco.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

Visible below the waves are memorials to the city's Gold Rush dead.

An essential stop before plundering, BYO Cutlass.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

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

Site of a former hidden treehouse in New Orleans.

The restaurant keeps a hidden séance room on the second floor and reserves a table for the spirit of the former owner each night.

Despite the ever pressing encroachment of urban sprawl this grand New Orleans manse still stands.

New Orleans' famous cemetery, located on the site of a former race track.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.