Concrete igloos standing across from what remains of the Michigan Central train depot.

A Beaux-Arts triumph rises from decades of decay to become the heart of a new innovation district.

The world’s largest Masonic temple was saved by the White Stripes.

Detroit’s downtown castle is one of the oldest structures in the city.

Inside the Wayne County airport is an amazing collection of lights and sounds.

The longest enclosed pedestrian bridge in the world spans 14 lanes of traffic and six rail tracks, all while lighting up the night sky.

This crumbling industrial fortress has attracted daredevils, filmmakers, and historians.

This unusual building straddles two countries.

This relatively recently abandoned brewery is a tragic reminder of the continuing effects of Hurricane Katrina.

Along the Palisades skyline are the ruins of a large mansion built in 1911 and demolished in the 1930s.

A 19th-century blast furnace that played a big role in the area’s industrial development.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

Home to the abandoned Tioronda Hat Works Factory, this park is a combination of woodlands and marshlands.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

A giant donut stands as a popular symbol of Los Angeles iconography.

This 'Murder House' grand mansion has starred in everything from Bones to Buffy.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

This jagged colossus of a building is mostly held together by an enormous concrete exoskeleton.

When the town wouldn't allow the fast-food behemoth to build a new restaurant, they put one inside an 1850 home.

Stone monument honoring a town founder has a witch-boot shaped stain and a curse to go with it.

This roadside stand claims to be the world's smallest bookstore.