With a design inspired by cruise liners, Hotel Lone looks more like a luxurious spaceship that’s landed in a pine forest. Set next to the glimmering Adriatic Sea, just near the old town of Rovinj, the Y-shaped hotel, with its tiered white curves, was Croatia’s first official Design Hotel. Inside, its tall, light-filled lobby is a lovely space with more curved lines and contemporary artworks. Outside, a large, free-form seawater pool, complete with whirlpools, waterfalls and geysers, is another unconventional but appealing feature.