A self-built castle made by a mysterious man.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

A geological mystery on Camelback Mountain.

A giant ball made from pieces of an old Jeep.

The Master of Magnetism dominates the walls of a scrap metal yard to keep graffiti artists at bay.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

Long hidden under grime, the politically radical murals of a little known Yugoslavian master are finally getting their due.

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.