An invitation-only museum of items natural and bizarre, arcane and exotic.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Only hotel where you can legally launder money.

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

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

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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

This lake’s emerald green waters are a spectacular sight, but it’s not a great place for a swim.

An unnatural lake in a naturally beautiful setting.

A brilliant turquoise lake in the mountains.

Bacteria and algae give the salty water its bubblegum hue.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

Giant sand sculptures of famous people and places are on display near the Tottori sand dunes.

An enigmatic modern marker left next to a historic Roman site.

A disconnected rotary phone for "calling" lost loved ones offered a unique way of dealing with grief in disaster-stricken Japan.

An architect transformed this abandoned cement factory into his castle-like workshop.

This lake in northwest Iran has started turning from green to red more frequently than scientists are comfortable with.

Neon signs that grace the windows of Bergdorf Goodman's and Tiffany & Co. come from this studio in Brooklyn.

The hollow trunk of this 650-year-old tree was used as a hideout by two Jewish brothers during World War II.

An institution dedicated to curiosity, logic, riddles, and Mongolia's long history of puzzles.

Trace the history of writing at this unusual North Carolina destination.