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

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

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

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

These grassy undulations on a stretch of University of Michigan campus aren't bad landscaping, they're art.

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

A Rocky Mountain city provides a happy ending for a pinto pony and his Brobdingnagian red chair.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

Soak in the life’s work of one of the country’s foremost modern artists.

The highway's southernmost spot is a beloved local attraction.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Most historians agree that the so-called "Gentleman Pirate" wasn't much of either of those things.

Once the most flame resistant building in the country, the South Carolina Historical Society building was almost burnt down in a fire.

This swanky speakeasy is Denver’s oldest bar—and hasn’t changed a bit since 1933.

Where beautiful signs live on forever.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

This sidewalk tribute honors Colorado's great culinary creation.

A mural and a few historical markers commemorate Denver's once-thriving Chinatown, which was obliterated in a racist riot.

In a small Japanese garden off a busy Denver street, a memorial to a brave, principled politician.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

A unique auditory experience right on the sidewalk.

These murals from the 1920s beautifully depict America’s industrial age.