This is one really big nut.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

An acoustic anomaly with a mysterious cause.

Unique tower has outlasted a takeover of the company.

A highway marker that honors a former spy plane pilot and local hero.

An enormous goose sits atop this nest-shaped home.

The second tallest railway trestle bridge in America.

A normal, unassuming pedestrian overpass has been the demise of many, many trucks.

A giant sculpture dedicated to a staple of South Bend food culture.

People come from across the globe to swim in this lake believed to have healing properties.

A rare tour of a commercial jet assembly plant, held inside one of the largest buildings in the world.

A giant milk bottle from the 1930s beckons drivers to this diner.

A 1940s nuclear reactor built to produce plutonium for the Manhattan Project.

An abandoned 19th-century hospital now swirling in ghost stories.

Nuclear reactor created the plutonium used on Nagasaki.

A library of only unpublished manuscripts.

An annual celebration of the infamous, unsolved skyjacking.

This playground sculpture of an icon from the past is dedicated to the children of the future.

This super-sized skillet is a replica of a usable giant pan where a woman once skated on bacon.

From overly ambitious (and eventually abandoned) atomic dream to bustling office park.

This bridge provides safe passage for squirrels.

Perhaps the world's only gas station inspired by a political scandal.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.