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

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.

With the touch of a button, you can read a randomly selected short story.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

A museum befitting the city responsible for supplying the majority of the world's LSD.

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

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

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

A psychedelic labyrinth on the San Francisco bay.

This Toronto garden collects stares and tchotchkes in equal measure.

This massive, ancient stone was disassembled and then put back together again.

Willy Wonka would love this weird half-a-home.

This urban oasis is a marvelous meld of music and landscape architecture.

A monument to the 17,000 Chinese who worked and died to build Canada's Pacific Railway.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.