Abu Dhabi is the capital city of the United Arab Emirates, located on an island off the mainland in the Persian Gulf. It is one of the most modern and rapidly developing cities in the world, with a culture of wealth from oil and gold. Popular tourist destinations include Ferrari World, Qasr-Al Hosn Fort, Yas World, Sheikh Zayed Mosque, and the upcoming Saadiyat Cultural District. The best time to visit Abu Dhabi is between December and March when the weather is mild.