Town of Gradac is a tourist hub of Gradac Riviera. Old settlement has been around since prehistoric times. Stone slabs from the Bronze and later Iron Age can testify to that fact. In Classical antiquity, Roman Civitas Biston existed in the location of Gradac. Old coastal hub of the Narona colony was an important Roman stronghold in this part of the Adriatic. Specimens of Roman money, and a rim part of a monumental structure from 2nd-3rd century were found at Gradina locality.