Spain’s capital and largest city, Madrid, is widely known for its sizzling nightlife scene. The city constitutes a diversity of ethnic groups, making it one of Europe’s most colorful cosmopolitan cities. Located within the city center are most of Madrid’s most popular tourist attractions such as the Royal Palace, the residence of Spain’s monarch. The heart of Madrid (and Spain) is Puerta del Sol, a large plaza serving as the scene of festivals, important gatherings and street performers as well as a hub for the public transportation network. Another important square is Plaza Mayor, known for the lively San Miguel Market.