First documented in the 11th century, Copenhagen became the capital of Denmark in the beginning of the 15th century. During the 17th century, under the reign of Christian IV, it became a significant regional centre. With the completion of the transnational Oresund Bridge in 2000, Copenhagen has become the centre of the increasingly integrating Oresund Region. Within this region, Copenhagen and the Swedish city of Malmö are growing into one common metropolitan area. In 2008, Copenhagen was the most visited city of the Nordic countries with 1.3 million international tourists.