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

Circleville is seriously smitten with this giant gourd.

The hallowed ground of one of the worst atrocities in United States history.

The walls of the statehouse tell the story of Ohio’s prehistoric past.

This remote Montana battlefield is the site of the Nez Perce Flight of 1877.

The United States' first transcontinental automobile road came to its end at this spot in San Francisco's Lincoln Park.

Marine fossils from the Devonian period are exposed at this park.

Long before the Battle of Gettysburg occurred, dinosaurs roamed the area and left their footprints on this bridge.

The site of a minor battle might have been forgotten if not for one participant’s famous family and the death of a respected warrior.

This Federal-style plantation house was once visited by Abraham Lincoln to meet with generals during the Civil War.

An interesting look into 18th-century American history.

This picturesque cottage was the site of Ulysses S. Grant’s final and perhaps most important campaign.

Approximately 50,000 gallons of water gush from these springs, creating the Metolius River.

A replica of the famous memorial statue at the Normandy American Cemetery hides in an office building in downtown D.C.

The site of the notorious Camp Sumter Prison is now a peaceful memorial.

The East Village tenement from the cover of Led Zeppelin’s 1975 album has a tea shop on the ground floor.

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

In the middle of an abandoned stretch of old Route 50 lies a tombstone that weighs three tons.

After covering almost 1.5 billion acres, the survey's still not finished.

Home of the physician who set the leg of John Wilkes Booth after the Lincoln assassination.

The crash of this great airship signaled the beginning of the end for dirigibles.

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

The original place where water met land in the City by the Bay is outlined in brass.

The Los Angeles flood disaster that took 400 lives and ended the career of William Mulholland.