Dubai is a city and emirate in the United Arab Emirates known for luxury shopping, ultramodern architecture, and a lively nightlife scene. Dubai is one of the world's most popular tourist destinations with the second most five-star hotels in the world, and the tallest building in the world, the Burj Khalifa. Located in the eastern part of the Arabian Peninsula on the coast of the Persian Gulf, Dubai aims to be the business hub of Western Asia. It is also a major global transport hub for passengers and cargo. Oil revenue helped accelerate the development of the city, which was already a major mercantile hub. A center for regional and international trade since the early 20th century, Dubai's economy relies on revenues from trade, tourism, aviation, real estate, and financial services.