Hidden beneath the streets of London is a secret subway that only carried mail.

Charles Babbage's proto-computer, painstakingly brought to life.

A gift from Abbot Kinney and a little bit of piece of Black history in Venice Beach.

A black and white mural stands out from its psychedelic surroundings.

Legendary prop shop filled with one man's collection of scientific curiosities.

In one Santa Monica parking lot a mushroom cloud made of chains heralds a message of peace.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

The Boston square dedicated to the dark poet who was born nearby.

This "Jewish Sistine Chapel" was designed to reinvigorate Judaism's artistic legacy but was almost lost to misguided restoration.

This seemingly unremarkable boulder is said to bear the hoofprint of the devil himself.

Hidden on the urban banks of a Manchester river are a series of abandoned waterside industrial sites.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

London's largest outsider art museum.

A roadside shrine to a late rock god only remains thanks to the unyielding efforts of his fans.

After over 100 years out of service this landmark windmill once again turns as a symbol of Jerusalem's self-sufficiency.

Sitting right on the border between East and West Jerusalem this modern art museum is in itself a symbol of Israel's hoped-for unity.

Biblical beasts and endangered animal preservation come together in this Israeli zoo.

The remains of this ancient fortress atop a manmade hill look as though they were built into a volcano.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

Manhattan and the Bronx have been playing tug-of-war over this former island neighborhood for more than a century.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.