Originally built as a villa in 1836 and transformed into a hotel in 1910 by Viennese architect Carl Seidl, the five-star Hotel Milenij is Opatija’s rose-hued crown jewel. Set above Kvarner Bay, it offers elegantly appointed rooms, the celebrated Restaurant Argonauti with its 1924 mythological frescoes, the Milenij Spa inspired by Empress Sisi, and direct access to the Lungomare promenade.