An obelisk commemorates historic floods that hit two towns along the Red River of the North.

This local museum documents centuries of history along the Mississippi, from mound builders to massive quakes.

Kentucky's anomalous peninsula projecting into the Mississippi River, site of legendary earthquakes and local feuds.

The world-record holder for the longest bridge stretching continuously over water.

The second-largest ceremonial mound in the United States is an artificial hill that is loosely shaped like a pentagon.

An eerie and beautiful group of columns mark the site of a grand mansion lost to time and fire.

A free museum that memorializes the deadliest river flood in American history, and the civil engineering efforts to tame the Mississippi River.

This iron and wood Civil War city-ship was the first vessel to be sunk by an electrically detonated torpedo.

The ill-fated plan to reroute the Mississippi so that Union ships could bypass Confederate fortifications on the river bend.

This ancient settlement contains some of the largest earthen mounds in North America.

Take a hike to this remote, scenic tea stop in the Canadian Rockies.

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

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

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

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

The oldest operating hotel in Illinois enjoys a historic (and some say haunted) past.

Nicknamed the "Grand Canyon of the North," this open-pit mine in Minnesota has a much shorter history.

America's silhouette includes 100 square miles of wilderness jutting into Canada thanks to an old mapmaking error.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

Before its closure in 2002, this South Dakota mine was the largest and deepest gold mine in Western Hemisphere.

A cemetery housing wild west legends in South Dakota.

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

This little gem of a museum is a hidden jewel filled with prehistoric treasures.

From this scenic rockface, you can still see the paths Western pioneers followed.