Arched stone tombs were found within burial mounds across Iowa. Many of these stone tombs contained the remains of giant humans.
The Grand River Times (Grand Haven, Michigan) May 21, 1856
Western Giants in Their Slumber
The Burlington Iowa Gazette says that while workmen were engaged in excavating for the celler of Gov. Grimes new building on the corner of Main and Valley Street, they came upon an arched vault some ten feet square, which, on being opened, was found to contain eight human skeletons of gigantic proportions. The walls of the vault were about fourteen inches thick, well laid up with cement or indestructible mortar. The vault is about six feet deep fro the base to the arch. The skeletons are in a good state of preservation, and we adventure to say are the largest human remains ever found, being over eight feet long.