A multi-storied adobe complex has been inhabited for more than a thousand years.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

These aggressively sustainable art homes look like something out of 1970's science fiction.

Experience a charming 1930s version of "infotainment."

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

The largest earthwork effigy in the world.

The highest rapid transit station in the world.

The mass grave of a heroic Revolutionary War regiment sits below an empty lot near the Gowanus Canal.

New York's oldest concrete structure is being preserved thanks to the gentrification of Whole Foods.

The unassuming structure was part of a Major League Baseball stadium.

This lone tree and dramatic sandstone outcropping are so beloved by Michiganders they can be found on one of the state’s coins.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

This historic Victorian hotel has a scandalous history of affairs and murder.

What happens when a sculptor has to find a way around a 100-year-old copyright.

A pixel art killer whale is frozen mid-leap in this Vancouver square.

Less a museum than a bizarre fantasy world created by artists and engineers.

Salute the leader of the proletariat.

A lush green oasis in the middle of Chicago.

Now the site of a high school, this was almost the location of the largest cathedral in the US.

Ironically this massive termite is the mascot for a company that is acclaimed for killing his kind.

Rhode Island's tallest building bears a resemblance to the "Daily Planet" building and has been empty for more than five years.

The stone sculpture of an Ottoman soldier is an homage to a lost Providence landmark.