The 25th President's marble casket can be visited in this classical Ohio tomb.

This massive airship factory is so large that it has its own indoor weather.

For decades, this waterfall remained hidden because of an artificial dam.

The largest ancient burial mound in Ohio.

This burger joint is named after everyone's favorite carnival prize and is adorned with a giant one over the door.

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

Tombstones carved to look like tree trunks are used for multiple generations of family members.

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

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

The body of one of the world's most famous outlaws is covered in cement and iron to prevent it from being stolen.

A flamboyantly decorated bridge signals diversity and fellowship at the entry to Indianapolis' Broad Ripple Village.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

This turn of the century jail once held Charles Manson.

The bespectacled, cocktail-sipping pachyderm is a strange but fitting liquor store mascot.

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

Ornate limestone building now filled with geologic specimens, and more.

The world's largest anatomically accurate brain sculpture.

If astronomy had a ghost, it would look like this observatory.

The only freestanding table rock formation east of the Mississippi.

The chiseled jaw of this forgotten American hero still stands tall in a small Indiana town.

The longest navigable underground river in the United States is home to countless blind and albino animals.

The former textile factory is now an oasis for the arts.

The world's longest known cave system.

Found down a long dirt road, a sacred Mexican cenote and 18th-century hacienda remain hidden.