A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

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

An unusual and beautiful form of mass transit serves the city's steepest neighborhoods.

This city park wants you to take your shoes off.

The history and future of cannabis.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

The world's only museum devoted to the wonders of fluorescence.

Cat art as far as the eye can see.

Museum preserving torture methods from the past.

A memorial to the victims of Argentina's "Dirty War."

This beautiful fountain was sculpted by a female artist who was ahead of her time.

A beautiful young girl said to have been buried alive in her coffin…

Xul Solar was an artist of alternate worlds, inventor of languages, and dreamer of utopias.

More gold than anywhere else, ever.

A hip bar decorated with walls of golden skulls.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Try not to get slimed in Tribeca.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.