Foreign migration to Copenhagen, rising over the last three decades, has contributed to increasing religious diversity; the Grand Mosque of Copenhagen, the first in Denmark, opened in 2014. Islam is the second largest religion in Copenhagen, accounting for approximately 10% of the population. While there are no official statistics, a significant portion of the estimated 175,000–200,000 Muslims in the country live in the Copenhagen urban area, with the highest concentration in Nørrebro and the Vestegnen. There are also some 7,000 Jews in Denmark, most of them in the Copenhagen area where there are several synagogues. There is a long history of Jews in the city, and the first synagogue in Copenhagen was built in 1684. Today, the history of the Jews of Denmark can be explored at the Danish Jewish Museum in Copenhagen.