A whimsical, but often overlooked clock in Park Avenue.

This Fifth Avenue church has long been the favored worshiping place of Broadway actors and vaudeville performers.

The one-time epicenter of American songwriting is now a little remembered Manhattan commercial block.

A semi-scholarly approach to sex.

Nikola Tesla's former home contains an homage hidden from plain sight.

The former hotel where Tesla invented the radio.

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

A collection of 20th-century automata, penny arcade games, and musical contraptions.

San Francisco's newly reopened hands-on science museum.

A man-made island in scenic San Francisco Bay.

Where a staggering 747 ships were constructed during World War II.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

A pier that used to act as a busy ferry dock is now a decaying favorite of local fisherman and urban artists.

Spiral labyrinth hidden in the hills above Oakland, CA.

This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

The rusting remains of the largest assembled WWII fleet on the West Coast.

Thousands of crosses and markers for soldiers who lost their lives in Iraq and Afghanistan blanket a California hillside.