"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

A bizarre house filled with an astounding array of collections.

This unassuming city park is home to three different types of Native American mounds.

The city of Rockford, Illinois is symbolically protected by a quartet of fittingly stony sentinels.

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

The mounds at this site were reconstructed with the help of archaeologists and historians.

See the nearly two-century-old ruins of pre-railroad America at the former site of a lock on the Ohio and Erie Canal.

Rows of 19th-century brick ovens used to process coal into coke form the center of a wooded park.

At the center of this cemetery stands a 2,000-year-old burial mound of the Adena culture.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

A monument to a Native American leader who was known for never breaking a promise and met his end after signing a deal with white settlers.

A miniature world of concrete and stone in Springfield, Ohio.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

Faces carved into the cliffs create an otherworldly walking trail.

A well-preserved example of an early industrial operation in the northeastern United States.

These ruins of an octagonal stone school that was later used as an A.U.M.P. church exemplify a popular school design from the 1830s.

These hooded graves are the only of their kind in the United States.

Pennsylvania's own Roswell-style UFO mystery.

A billionaire heiress' menagerie of animals were lovingly laid to rest on the grounds of her former estate.

An unusual and eclectic collection of local historical memorabilia.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

This jail which was in service for over a century is now open for curious visitors.

The site of a tragedy in 1908 that claimed the lives of 171 people and changed fire safety laws across the state.