This spot in St. Louis, marked with a simple sign, has seen more pro baseball than just about anywhere else in the world.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Man-made geyser that rises to the exact height of the Gateway Arch.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

One of few surviving standpipe water towers in the U.S.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

The lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

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.

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

Lovingly nick-named the "Brick Dick" this municipal tower was winner of the World's Most Phallic Building Contest.

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

Now nearly abandoned, Kaskaskia was once the capital of Illinois and one of the most important towns on the upper Mississippi.

A mining town once rife with murderous disputes over its copious treasures now creates income as a popular spot for photo shoots.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Experience a charming 1930's version of "infotainment."

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

The Midwest's reigning king of surplus stores is full of nothing you need and everything you want.

Minnesota's oldest and deepest mine is now an underground physics laboratory.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.

The famed architect designed this Minnesota gas station of the future with a lookout tower.