The carved remains of a 200-year-old oak tree memorialize the namesake of the iconic "Wizard of Oz" character.

The first spinning jail built in the United States is the only one that still turns.

A large circus museum with summer performances.

A metal ring in the middle of the road marks the exact spot where the Soviet satellite crash-landed in 1962.

A town honors its legacy of traditional American Indian pipe carving with one gigantic pipe.

A roadside collection of over-sized iron creations that are a bit more macabre than most.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

A tribute to the twin ideals of religion and patriotism, built by a Catholic priest from rocks, glass, and innumerable found items.

A winged-helmed, sword-brandishing tribute to German Americans.

The lowest point in South Dakota and the source of the Minnesota River.

A fitting attraction for the corn capital of the world.

This pebble beach is so beautiful that taking its rocks is against the law.

These molds for fiberglass statues have formed an eerie, accidental sculpture park.

Former meatpacking facility turned vertical farm and sustainable business complex.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

Just a man taking his prehistoric pet for a stroll.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

This sculpture gallery is home to magnificent beasts made of scrap metal and found objects.

This Wild West attraction is alive with glitching automatons.

The remnants of this Douglas fir predate Columbus's arrival in North America.

A wonderfully curated used bookstore in an airport.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

Literally a million fascinating cartographic artifacts are held in this sprawling university collection.