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

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

A Barbary Coast watering hole built into a Gold Rush shipwreck.

An art supply shop holds the secrets of this quiet neighborhood's raucous Barbary Coast past.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

An artist's cute bronze subway sculptures belie his violent artistic past.

A memorial to Chinese freedom in the city where American freedom was born.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

These items are all that remain from the room used by the author during his second tour of the U.S.

This statue intended for children to enjoy became a minor political spat.

Dedicated to one of the darkest moments in Irish history.

What may be Boston's finest Art Deco building, located in the city's Financial District.

Every December the Wannalancit Mills lights a Christmas Tree over the old mill's smokestack.

This plaque commemorates the call between Alexander Graham Bell and Thomas A. Watson.

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.

An homage to Jackie Gleason's bus-driving character from 'The Honeymooners.'

This quirky piece of naval artillery has been deafening Canadians for over a century.

The colorful, smiling concrete silos of Vancouver.

This elaborate towering structure was once famed for its revolutionary height.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A statue honors the genius who allegedly first took a meatball and made it into a hamburger.

This animatronic Christmas village within an industrial park creates a whimsical juxtaposition.