This remarkably simple jail went over a century without an escape.

This municipal playground was co-created by the father of one of the most playful characters ever.

An abandoned Cold War missile radar site.

A unique botanical garden housed in three giant geodesic domes.

What appears to be a wizard's lair in Milwaukee actually houses a massive water pipe.

This supper-club-turned-concert-venue still serves drinks at its original rotating bar.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Travelers exchange letters with woodland creatures at this mini post office.

One of Auckland's oldest cemeteries was partially demolished during the construction of a major highway in the 1960s. 

Alleyway plaque commemorating the death of a fictional character in The Maltese Falcon, not far from the author's home.

The original place where water met land in the City by the Bay is outlined in brass.

The last of a gourmet supermarket chain, this store helped spark California's Food Revolution.

A porcelain company's former dumping ground, completely covered in pieces of collectible ceramics.

The first fresco Diego Rivera painted in the United States can be found in the former San Francisco Stock Exchange.

One of the last remnants of the city's Chinese nightclub scene is now a dive bar selling killer mai tais.

An ancient neolithic tomb that only sees the sun twice a year.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

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

The humble tomb of an Argentine general, hand-built by his son using stones brought down from the Andes.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

The narrowest house in Buenos Aires is less than 10 feet wide.

Museum housed in underground tunnels that date back to Buenos Aires's earliest settlements.