W Barcelona
The city's only true beachfront hotel, this towering sail-shape monolith by architect Ricardo Bofill is more of a self-contained urban resort, with multiple restaurants and bars, indoor and outdoor pools, lounge decks, plus a sprawling spa and gym—and just about every space has sea views. Beds in the sleek, open-plan rooms face floor-to-ceiling picture windows with spectacular vistas of the beach, the Mediterranean, or the port.