The final resting place of the world's first nuclear reactor.

World's smallest skyscraper, the product of a remarkable con.

The meeting of the northwestern corner of Delaware, the northeastern corner of Maryland, and the southern edge of Pennsylvania.

Operational for less than a year, this mill produced more than 11,000 tons of chrome concentrate in its short lifespan.

Is this 47.7-mile stretch of highway the longest straight road in the United States?

A unique, free-floating electric ferry may be the only of its kind in Europe.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

This is the last hand-cranked chain ferry of its kind in operation in the United States.

Inside the simple black-and-white exterior of Église Sainte-Cécile hides a pastel wonderland.

The brainchild of Eleanor Roosevelt, her "Little Village" was a collectivist dream.

This former zinc operation has a 90-year toxic history.

A 21-foot-tall statue of a miner made of scrap metal stands in this West Virginia coal town.

A plaque on the side of a building is a small tribute to the woman who invented an iconic Berlin fast food.

This red-eyed chrome beast pays homage to the popular modern myth of West Virginia's insectoid monster.

This stone incorrectly marks the 35th parallel, causing some territorial kerfuffles.

This small piece of Michigan is entirely surrounded by Ohio.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This marker identifies the location where three states converge.

A home built with marble tombstones from the graves of 2,200 Union soldiers buried in a Virginia cemetery.

The former broadcast site has been reimagined as a museum about the medium.

Built around 1845, this house was occupied for 100 years, serving as a home to a prosecuting attorney, a Union Civil War general, and a wealthy socialite.

Now in disrepair, this 19th century station was a stop on of the famed B&O Railroad.

How did a massive marine arthropod find its way to landlocked Ohio?

Cemetery featuring rare glass-fronted columbarium.