Luxembourg is a founding member of the European Union, OECD, United Nations, NATO, and Benelux. The city of Luxembourg, which is the country's capital and largest city, is the seat of several institutions and agencies of the EU. Luxembourg served on the United Nations Security Council for the years 2013 and 2014, which was a first in the country's history. As of 2020, Luxembourg citizens had visa-free or visa-on-arrival access to 187 countries and territories, ranking the Luxembourgish passport fifth in the world, tied with Denmark and Spain.