Visit the Villa Angiolina, a former summer residence and today the seat of the Croatian Museum of Tourism. The museum hosts various exhibitions, workshops and projects that will explain to you why Opatija was a favourite destination for many historical figures.
This is the building that certainly marked the beginning of the tourist epoch in the history of Opatija. Pending its building in 1844. (actually a reconstruction of an older building owned by baron Haller von Hallerxtein); Opatija was a relatively large settlement with about 120 houses, clustered mainly around plots further away from the sea coast and chiefly oriented towards fishing and seafaring. With the arrival of Iginio Scarpa, a patrician from Rijeka, and building of his summer house Angiolina (named after Scarpa’s then already deceased wife, originating from the Sartori family), Opatija opened her doors to a whole line of guests and passengers, among whom it is noteworthy to mention the Austrian empress Mary Ann, the botanist Heinrich Noë, the croatian ban Josip Jelačić and others who in their enthusiasm for the local vegetation and climate spread the fame about Opatija and thus prepared the ground for the future health resort.
https://www.visitopatija.com/en/villa-angiolina-learn-about-the-role-of-tourism-in-the-history-of-opatija-p471