To truly appreciate Detroit's landmark skyscraper, you have to step inside.

A comprehensive archive of Hallmark Holiday ornaments.

One of the few working locomotive roundhouses in the United States.

On the shores of Lake Superior, a small group of monks makes sacred sweets.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

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

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

The only surviving prototype for Buckminster Fuller's house of the future.

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

New fungal and bacterial species call this deadly lake home.

The only road through the heart of Glacier National Park.

A notable example of Prairie School architecture that disregarded Victorian concepts about room divisions and featured a long, narrow floor plan.

Vice President Humphrey's final resting place is tucked away in this cemetery along with a few other notable figures.

Sleepy Minneapolis block beats Guinness Record for most churches on one city block.

A stone face watches over the river.

Sculpture garden and miniature golf course blend together in the oversized backyard of a Minnesota sculptor.

Each year, one talented artist puts on a show sculpting twelve butter-based busts of dairy princesses.

A treehouse assailed by the elements and the government, now gone.

The site of Minnesota’s worst mining disaster, now reclaimed by nature.

A damaged tree turned into a whimsical giant pencil that is sharpened each year.

This unassuimng grain elevator, commonly confused for a smokestack, helped inspire the modern architecture movement.

A memorial to the late U.S. Senator Paul Wellstone, who died at this location, along with seven others, in a plane crash in 2002.

This landmark honoring a local beer brand is an iconic part of the Minneapolis skyline.