Nestled among the myriad islets of the Istrian coast in the Gulf of Venice, the charming harbor of Rovinj is comprised of candy-colored buildings, fringed with marinas and dominated by the fairytale spire of the Cathedral of Saint Euphemia, modeled on St. Mark's in Venice. The old town is a treasury of historic monuments - a 13th-century Romanesque baptistery, a Baroque City Hall, and an 18th-century monastery - all tucked among cobbled streets that invite exploration. Known as the "Montmartre of Istria," Rovinj is an artists' colony with many galleries.