Hot Tokyo architectural firm Super Potato has created a 24-story glass masterpiece of design in the heart of South Korea's capital. The Park Hyatt Seoul's got the largest guestrooms in the city, their entrances flanked by marvelous Korean antiques. These contemporary and stylish spaces offer floor-to-ceiling windows, custom-designed feather beds, 32-inch LCD screen television and internet access, and spa-inspired bathrooms with soaking tubs and rainwater showers. After a work-out or luxurious spa treatment, head to the top-floor infinity pool for panoramic views over the city.