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

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

The first rural cemetery west of the Mississippi is home to the elaborate tombs of St. Louis' local beer barons.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

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

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

Famous church recognized for both its unique design and disciplined monks that live according to the Benedictine discipline.

A big museum full of little worlds.

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

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

Giant granite rocks standing end-to-end like a train of circus elephants.

This is not your typical jungle gym.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

European castle ruins in an American state park are actually the product of death and grief.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

The site of America's first commercial oil well essentially disappeared after the town went bust.

Memorializing an American tragedy of massive proportions.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

Steepest flood safety railway in the entire world.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

There aren't too many operational funiculars around, but Pittsburgh has two!

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.