This stone tower was built to protect Crete from incoming pirates.

The haunting ruins of Jack London's dream house.

The fossilized remains of ancient California redwoods.

One of the smallest parks in San Francisco honors the legacy of the "Mother of Civil Rights in California."

A sudden forest of traditional Papua New Guinean art works is hidden in a corner of Stanford University.

The world's most famous donkey lives in this pen.

The world’s first stop-motion film was created on the racetrack outside this building.

The Internet Age began with a transmission from this biker bar.

A small island with shimmering pink sands, home to loggerhead turtles and rare plants.

A tiny slice shop hides down an unmarked hallway in a Las Vegas casino.

In 1998, Larry Page and Sergey Brin briefly ran their fledgling company from this Silicon Valley garage.

This redwood is a historic landmark, a town’s namesake, and the dancing sideline symbol of Stanford University.

The headquarters of the semiconductor giant has a 10,000-square-foot museum.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

A tribute to the artist and activist who created the rainbow pride flag.

These subterranean storage areas hold emergency water reserves.

Gold Rush-era tombstones line the park's paths.

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Early prototype for Frank Lloyd Wright's Guggenheim.

The historic building's ornate stained glass fixture has survived the devastating 1906 earthquake, ensuing fires, and multiple redevelopment attempts.

A six-ton wedding present for the King of the Scots.

Artists and musicians now rule over this former rail station.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.