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

At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

Art in the form of a winding, man made crack in stone.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

This grinning pup statue is all that's left of what was once a ubiquitous Bay Area diner chain.

A monument to the love people have for their pets.

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.

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

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

Spiral labyrinth hidden in the hills above Oakland, CA.

The Boston square dedicated to the dark poet who was born nearby.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

Whimsical cookie-themed plaques mark the birthplace of the Fig Newton.

A tiny monument to the classic American candy.

A home decorated by its owner with eye-catching and captivating assemblages of found objects

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

This hidden labyrinth offers walkers some brief peace of mind.

Memorial to a beloved puppeteer as well as all street performers.

This tower commemorates the spot where George Washington hoisted the Grand Union flag.

This cemetery served as the only official burial grounds in Cambridge for nearly 200 years.

Three prestigious academic collections come together to create a world-class natural history museum.

Impossibly life-like natural history models created out of glass by a father and son.