The Los Lunas Decalogue Stone is a large boulder on the side of Hidden Mountain, near Los Lunas, New Mexico (Wikipedia page [1]), about 35 miles south of Albuquerque, that bears a very regular inscription carved into a flat panel. The stone is also known as the Los Lunas Mystery Stone or Commandment Rock. The inscription is interpreted to be an abridged version of the Decalogue or Ten Commandments in a form of Paleo-Hebrew. A letter group resembling the tetragrammaton YHWH, or "Yahweh," makes three appearances. The stone is controversial in that some claim the inscription is Pre-Columbian, and therefore proof of early Semitic contact with the Americas.

The Los Lunas Decalogue Stone is often grouped with the Kensington Runestone, Dighton Rock, and the Newport Tower (Wikipedia page [2]) as examples of American landmarks with disputed provenances. Other disputed American Hebrew inscriptions include the Smithsonian Institution's Bat Creek Inscription and the Newark Ohio Decalogue Stone, Keystone, and Johnson-Bradner Stone.

More information on the Wikipedia page [3]

More material here [4]: there are many other sites.