Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

You thought Santa Claus didn't exist, but it turns out you were wrong.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

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

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

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

The original vault that held the president's remains still stands, empty, not far from where he was finally buried.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

A bizarre house filled with an astounding array of collections.

A museum chronicling pioneer life constructed over Interstate 80.

What do a giraffe, an elephant, and reasonably priced steaks have in common? This roadside restaurant filled with exotic taxidermy.

This erect, phallic geological spire wasn't always named so domestically.

An experimental, automotive replica of Stonehenge.

A cemetery housing wild west legends in South Dakota.

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

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

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

One of America's first dinosaur parks gives a window into Depression-era paleontology.

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