A 19th-century horse lover's bequest led to the construction of this unique fountain in Chicago.

A Museum of Holography frozen in 1974.

The palatial McDonald's that inspired Wesley Willis.

Odd, decrepit fountain honors Chicago author who had mixed feelings about his hometown.

Built to house a chapter of the Knights Templar, this grandiose building is a relic of Freemasonry in Chicago a century ago.

Elevated freight railway turned wildly successful urban park.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

A music-filled, booze-soaked oasis in the desert.

A self-built castle made by a mysterious man.

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

The beloved home to all publications indie, erotic, and punky.

With 8,000 pipes this giant instrument is the most versatile theatre pipe organ ever built.

Crumbling hotel echoes with the sounds of the '30s.

On this Puerto Rican island, many abandoned naval ammunition bunkers sit open while a few have been padlocked by locals as personal storage.

To find the "unicorns of the deep" you've got to go downstairs.

These abandoned grain silos and tunnels are an urban exploration dream.

These unusual rooms on wheels are holdovers from the 1960s.

This old residential building was once the largest flour mill in the world.

No one knows how many bodies are in this vault in a Chicago public park.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

A historic beacon built in the aftermath of the worst maritime disaster on the Great Lakes.

The menacing creature had a tremendous influence on the local culture before being exposed as a hoax.

This odd-shaped relic from the 1964 New York World's Fair found its way back home to Wisconsin.