Most of Constanța's sights cluster in the Old Town on the small peninsula that juts into the Black Sea, around Ovidiu Square (Piața Ovidiu) and the seafront promenade. A morning walks the old quarter; an afternoon takes the bus or a slow walk north to Mamaia if the season is right. The Casino, the Grand Mosque and the History Museum are unmissable; the rest reward a leisurely pace.