Singapore

Singapore is a city-state, as it is a sovereign island. Considered the cleanest city on Earth, it is home to many unique attractions. For the ultimate resort experience, stay at Marina Bay Sands, featuring a hotel, casino, futuristic museum, the world's longest infinity pool on its roof, and more. But that's just the start, as Gardens by the Bay and Cloud Forest will take you and your imagination to new places. Even the airport is worth visiting, with a seven-story indoor waterfall.