One of the last surviving C-97s sits in a field in front of a Wisconsin inn.

An Iowa town celebrates its heritage with the tallest working Dutch windmill in North America.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

An antique Beechcraft airplane serves as a giant windsock for people driving through the blustery open country of eastern Wyoming.

This shallow pit was once used to send over 20,000 buffalo plummeting to their death.

This record-setting hydraulic dam in the Montana badlands was one of FDR's most ambitious public works.

The ruins of Theodore Roosevelt's beloved ranch stand in a forgotten corner of a national park named after him.

One man's quest to save his town with a trail of record-breaking sculptures.

A monument to the center of the North American continent may be off by a few miles.

The world's tallest turtle riding the world's largest snowmobile.

This park straddling the United States-Canadian border has been a symbol of peace since 1932.

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

For over a century, it was a crucial center of mental health treatment and also the source of many local legends.

A little-known memorial to servicemen and nurses killed in the line of duty during the First World War.

These curious caverns have been home to mushrooms, gangsters, and disco.

Inside this museum resides a boot fit for a giant.

For just a few bucks, this Iowa funicular will let you feel like an 1800s fat cat.

A bizarre house filled with an astounding array of collections.

Spectacular views await visitors to this lake.

The only road through the heart of Glacier National Park.

This museum is a full-size replica of an original church constructed during the 13th-century.

Part of a secret 1970s nuclear defense program is now open to the public.

Minnesota's oldest and deepest mine is now an underground physics laboratory.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.