Turkey Mountain inscriptions refers to some markings on a rock face in Turkey Mountain, a large hill on the west side of the Arkansas River in Tulsa, Oklahoma. These markings are believed by some enthusiasts to be petroglyphs left by pre-Columbian European travelers. The idea that there were pre-Columbian European travellers in the Americas, apart from the Vikings in Newfoundland, is considered a Fringe theory or Pseudoarchaeology. Background It has been rumored that the site was a hobo shelter in the 1920s. Gouges at the narrow hallway's entry seem to indicate that a gate had once hung here. Notches cut in the slab's top and the opposite cliff further suggest boards had once been in them for the roof.