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.

This turn of the century masterpiece has a mysterious goaty interloper.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Guns that have been defending San Francisco since 1904.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A community gathering place that once housed half-ton tanks and the World's Fair.

A museum dedicated to the history and exploration of both popular music and science fiction.

The Denny Substation has been called "the coolest substation in the world" and sits in a densely populated Seattle neighborhood.

An old-timey peepshow allows visitors to gawk at some of the world's most freakishly large footwear.

A wall of chewing gum moonlights as collective art.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

A walk through the historic city center, under the streets of Seattle.

City Council meetings still happen in this historic building, impeccably preserved on the inside.

The narrowest street in Canada was once a spot for dastardly doings, now a historic piece of Chinatown.

First flying reptile discovered in British Columbia was for years forgotten in a cabinet.

This historic Victorian hotel has a scandalous history of affairs and murder.

The farm toy capital of the world hosts a museum filled with toy tractors dating back to the late 1800s.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

A stone marker memorializes the spot where the King broke up a street fight with a classic karate stance.