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

An abandoned factory along the Mississippi coated by a giant mural.

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

A wax effigy of St. Valentine hides one of the saint's relics.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

This simple gravestone remembers a pig who single-hoofedly raised $19,000,000 for the Navy.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

This life-size bronze statue remembers the tallest recorded human in his Illinois hometown.

A mythical bird etched into the face of a rock doubles as the mascot for a nearby school.

University City's quirkiest resident lives in a park named after its first.

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

Even with its slightly risible name this colossal cross is still able to inspire awe.

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

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

Erosion and time have created a naturally-formed water park.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

A 35-foot-tall fork stuck in the ground outside an office building in Missouri.

When you can afford only half a road, you build only half a road.

This historic folk art garden contains a nightmare tower that claims to be the world's largest concrete totem pole.

Nature's biggest mammal swims in landlocked Oklahoma.

These massive mitts are made of 30 tons of devotional bronze.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

An acoustic anomaly with a mysterious cause sits in the heart of Tulsa.

Along the historic Mother Road is an old gas station with a secret counterfeiting past.