The European Union (EU) is a supranationalpolitical and economic union of 27 member states that are located primarily in Europe. The union has a total area of 4,233,255.3 km2 (1,634,469.0 sq mi) and an estimated total population of about 447million. The EU has often been described as a sui generis political entity (without precedent or comparison) combining the characteristics of both a federation and a confederation.
The 1985 Schengen Agreement is an agreement among European states which allows for the abolition of systematic border controls between the participating countries. It also includes provisions on common policy on the temporary entry of persons, the harmonisation of external border controls and cross-border police co-operation. A total of 30 countries – including all European Union states and three non-EU members Iceland, Norway, and Switzerland – have signed the agreement and 26 have implemented it so far. The Republic of Ireland and the United Kingdom only take part in the police co-operation measures and not the common border control and visa provisions. Border posts and checks have been removed between Schengen countries and a common 'Schengen visa' allows tourist or visitor access to the area.
Zagreb is the capital and the largest city of the Croatia. It is located in the northwest of the country, along the Sava river, at the southern slopes of the Medvednica mountain. Zagreb lies at an elevation of approximately 122 m above sea level. In the census of 2011 the population of the city was 790,017.
Zagreb is a city with a rich history dating from the Roman times to the present day. The oldest settlement in the urban area of the city is Andautonia, a Roman settlement in the place of today's Ščitarjevo. The name "Zagreb" is mentioned for the first time in 1094 at the founding of the Zagreb diocese of Kaptol, and Zagreb became a free royal town in 1242, whereas the origin of the name still remains a mystery in spite of several theories. In 1851 Zagreb had its first mayor, Janko Kamauf, and in 1945 it was made the capital of Croatia when the demographic boom and the urban sprawl made the city it's known nowadays.
Image 22A cartogram depicting the population distribution between old EU-27 member states in 2008 (including the UK and excluding Croatia). 58% of all citizens of the EU live in the four largest member states: Germany, France, Italy, and Spain. (from Demographics of the European Union)