A memorial dedicated to the victims of the Columbine High School shootings.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

Massive still life just off the highway in Kansas.

This spectacular track has run continuously since 1882.

This log house sits in the remote Canadian wilderness, and holds a mysterious tale of the trapper who built it.

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

A plaque on the side of a parking garage marks the burial place of a great Ottawa chief.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

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

This historic church with a connection to "Uncle Sam" is now a fraternity house.

This zombie-themed restaurant stands out in the heart of corn country.

The first declared National Monument in the United States.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A tunnel with windows, so you don't miss out on the impressive views.

A small town garden is dedicated to a psychic dog with the most soulful eyes.

Crystal hunters can dig for their own stones at this DIY mine in Arkansas’ quartz belt.

Two gushing waterfalls of hot spring water within a block of each other.

A theme park featuring a replica of Noah's Ark built to the measurements specified in the Bible.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

Stroll through a wonderland of stupendous moss-covered trees.

The 32nd president's sprawling cottage sits on an island enclave jointly managed by the U.S. and Canada.

This candy-striped tower is the farthest east you can go in the United States.