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 a small Puerto Rican island, banks of secret naval bunkers lie abandoned and filled with piles of office equipment.

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.

Whimsical sculptures dot a woodland path surrounding their creator's old summer cottage.

One of the few remaining relics of the meatpacking hub that made Chicago the "hog butcher to the world."

This house renovated by Frank Lloyd Wright was the centerpiece of a lavish 20th-century estate.

This cheeky statue of a man defecating gold coins graces the facade of a medieval guildhall.

This extensive collection of dead bugs may be the world's most idiosyncratic and personal insect museum.