"Turtle Mound at New Smyrna, containing interesting Indian relics."
"Florida: Empire of the Sun" Published in 1930 by the Florida State Hotel Commission, Tallahassee, Florida. Library of Roy Winkelman.
Located in the Canaveral National Seashore.
Turtle Mound is the highest shell midden in the nation. This two-acre site contains over 35,000 cubic yards of oyster shell, extends more than six hundred feet along the Indian River shoreline, and stands about fifty feet tall. (In prehistoric times, it was at least seventy-five feet high.)
There's more than one Turtle Mound - this one's Legendary:
You can even make your own: