The southernmost city in the continental United States, nestled at the very end of the Florida Keys, closer to Cuba than Miami, and the capital of the imaginary Conch Republic, Key West is both wildly popular and truly eccentric. Your first clue will be the many laid back residents who like you, came for a visit at first, but afterwards quite literally never left. People stay for a good reason, as Key West, the most tropical of US cities, boasts extraordinary natural beauty and a nearly perfect and constantly sunny climate--you'll have to wait for the next ice age before the temperature dips below freezing here.