Over a thousand feet beneath the Detroit streets is a subterranean metropolis few are allowed to enter.

A park and memorial dedicated to the victims of the deadliest school massacre in American history.

This lovely public park has an intriguing past and unique wooden bridges made of concrete.

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

An ever-evolving wall of graffiti art off East Liberty Street.

Unique Michigan homes look like something out of Tolkien's "The Lord of the Rings."

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

The writing studio of an American adventure author, built in the style of a medieval castle.

A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

The bones of an old zoo crumbling in the shadow of a new one.

Strange physical sensations and optical contradictions keep visitors coming back for more.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

Astounding collection of coin-operated games and automata.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

The city is full of whimsical portals to another world.

This freshwater spring fills with 10,000 gallons of water per minute.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

This sprawling bookstore spans four floors and has more than a million books in stock.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.