Cattolica is the LAST town of Romagna before the Marche region begins. Smaller and quieter than Rimini (10km north), with the same Adriatic beach but 1/5 the chaos. The Acquario di Cattolica (Le Navi) is the largest aquarium on the Adriatic coast — sharks, rays, penguins, turtles, 3,000+ marine species. For families: Cattolica is the smarter choice over Rimini — less nightlife noise, better for sleep, the aquarium for rainy days, and the same sand+sea.
Acquario di Cattolica (Le Navi): Built in a 1930s Rationalist-era colonia marina (seaside resort) — the architecture itself is worth seeing. 4 routes: Blue (sharks, rays, 70+ species of Mediterranean and tropical fish). Yellow (River monsters, piranhas, caiman). Green (Reptiles, insects). Purple (Educational/temporary). €24 adults, €18 children. 2-3 hours. The beach: 2km of sand, family-oriented stabilimenti (€15-20/day), shallow Adriatic. The fishing harbor (Porto): Morning fish market + restaurants serving the catch. Piazza I Maggio + Piazza Roosevelt: Pedestrianized center — evening passeggiata, gelato, the social life of a seaside town.
From Rimini: Train 10 min. From Bologna: 1.5h. Family strategy: Stay Cattolica (quieter, cheaper) and day-trip to Rimini (Fellini Museum, nightlife) if you want. Combine with: Gradara (10 min — the castle of Paolo and Francesca from Dante's Inferno). San Marino (30 min — the world's smallest republic). Romagna coast →