The world's longest known cave system.

A tribute to the twin ideals of religion and patriotism, built by a Catholic priest from rocks, glass, and innumerable found items.

This long unused shot tower on the Mississippi remains a point of pride for a small city in Iowa.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

The childhood home of the Wright Brothers in Dayton.

A dazzling display of lights and crystals.

The only depiction of Abraham Lincoln holding a weapon, and the names of all 9,000 Cuyahoga veterans of the Civil War.

One of the largest collections of holy relics in the country.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

This Czar-funded, onion-domed, lavishly muraled Orthodox Church played a starring role in "The Deer Hunter."

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

Rare recess caves fill this unbelievably beautiful Ohio park.

A humble homemade ride attracts visitors from around the globe to this small Midwestern town.

A former limestone quarry has found a new life as a flourishing community garden.

Purdue students would lean over this iron fence to skirt campus rules against smoking and courting.

Train cars and railroad artifacts abound at this restaurant devoted to railway history.

Walk in the footsteps of the famed astronaut at Purdue University.

An unknown number of cholera victims are buried in two nondescript graves.

Historians and hobbyists head to this former French outpost for the annual Feast of the Hunters' Moon.

For over 100 years, this Indiana town has had a tree growing out the top of the local courthouse.

This former Indiana quarry has been transformed into a park and SCUBA site where divers can explore the drowned mining equipment.

The large rock formation where the Shawnee prophet Tenskwatawa stood and encouraged his warriors during the Battle of Tippecanoe.

This unassuming home was once “grand central station” for the Underground Railroad.