Castle Miramare Castle, from the bay of Grignano Adriatic Sea, Bay of Grignano, Italy, Trieste The castle ? Miramare. The builder ? austrian Archduke Ferdinand Maximilian, based on a design by Carl Junker. The completion ? built from 1856 to 1860. The location ? Bay of Grignano, on the Adriatic Sea, near Trieste, northeastern Italy.