This archaeological dig site and museum is home to one of the largest dinosaur fossil collections in the world.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

A life-sized recreation of the megafauna that once roamed this region is a feature at the birthplace of American paleontology.

The site of the gruesome massacre—and maybe cannibalism—of five men, a tragedy that made Alferd Packer infamous.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

At a mile long, the Fort Madison Bridge is the largest double-decker swing-span bridge in the world.

Architectural elements and building materials for this house were transported from Salisbury, England.

The peaceful space is adorned by paintings by the famed abstract artist Mark Rothko.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Elaborate hand-carved wooden clocks two brothers made in their spare time are on display at this handsome little museum.

Most comprehensive museum in America devoted to one ethnic group.

America's first National Historic Landmark is a 100-foot tall obelisk and gravesite dedicated to the only casualty of the Lewis & Clark Expedition.

A unique work of outsider art sourced from scrap metals and signifies conservation.

The last location where Buddy Holly, Ritchie Valens, and J. P. "The Big Bopper" Richardson played before their tragic deaths.

A museum showcasing the life of "Buffalo Bill"

An underground wonderland in Iowa.

A wonderland of caves in eastern Iowa.

The farm toy capital of the world hosts a museum filled with toy tractors dating back to the late 1800s.

One of the largest private collections of fossils in the world.

This remote island in Iowa was abandoned after being devastated by flood.

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