Olfactory delights in San Francisco's Botanical Gardens.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

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

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

The only theatre in the world constructed specifically for sound movement.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

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

An artsy hidden staircase leads to breathtaking views of San Francisco.

A psychedelic labyrinth on the San Francisco bay.

A huge musical instrument played by the ocean.

This rare example of Vancouver's Victorian past was the home of one of the city's first bookbinders.

Two graffiti towers stand like ghosts of Vancouver's World War II-era defensive outpost.

This conservatory allows a little bit of the tropics to thrive in the middle of a major Canadian city.

This Elizabethan hedge maze is one of only six in North America.

A bibliophile's heaven that contains hundreds of bookstores, offering over a third of secondhand books for sale in Tokyo.

An ordinary pond with fish from out of this world.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A crumbling hospital from the 1850s on Roosevelt Island.

A terrific purveyor of natural history objects and curios.

This Paleolithic cave may be the oldest cemetery in North Africa.

These petroglyphs created by ancient Arizonians have withstood centuries of exposure to the elements.

The largest volcanic caldera in Japan holds an entire city in its maw.

This sawtooth mountain range still bears the strangely lovely marks of its history as a medieval quarry.