Title: Brussels and the European Union
Content:   Brussels (Belgium) is considered the de facto capital of the European Union, having a long history of hosting a number of principal EU institutions within its European Quarter. The EU has no official capital, and no plans to declare one, but Brussels hosts the official seats of the European Commission, Council of the European Union, and European Council, as well as a seat (officially the second seat but de facto the most important one) of the European Parliament. In 2013, this presence generated about 250 million euros (8.3% of the regional GDP) and 121,000 jobs (16.7% of the regional employment).
Title: Brussels
Content:   Brussels serves as de facto capital of the European Union, hosting the major political institutions of the Union. The EU has not declared a capital formally, though the Treaty of Amsterdam formally gives Brussels the seat of the European Commission (the executive branch of government) and the Council of the European Union (a legislative institution made up from executives of member states). It locates the formal seat of European Parliament in Strasbourg, where votes take place, with the council, on the proposals made by the commission. However, meetings of political groups and committee groups are formally given to Brussels, along with a set number of plenary sessions. Three quarters of Parliament sessions now take place at its Brussels hemicycle. Between 2002 and 2004, the European Council also fixed its seat in the city. In 2014, the Union hosted a G7 summit in the city. Brussels, along 
Title: Brussels
Content:  and civil servants. Brussels is the de facto capital of the European Union, as it hosts a number of principal EU institutions, including its administrative-legislative, executive-political, and legislative branches (though the judicial branch is located in Luxembourg, and the European Parliament meets for a minority of the year in Strasbourg). Because of this, its name is sometimes used metonymically to describe the EU and its institutions. The secretariat of the Benelux and the headquarters of NATO are also located in Brussels. As the economic capital of Belgium and one of the top financial centres of Western Europe with Euronext Brussels, it 
Title: Institutional seats of the European Union
Content:  The seven institutions of the European Union (EU) are seated in four different cities, which are Brussels, Frankfurt am Main, Luxembourg City and Strasbourg, rather than being concentrated in a single capital city. The EU agencies and other bodies are located all across the union, but usually not fixed in the treaties. The Hague is the only exception, as the fixed seat of the Agency for Law Enforcement Cooperation (Europol). Over the years, Brussels has become the EU's political hub, with the College of the Commissioners — the European Commission's politically accountable executive — and the European Council both meeting at their Brussels-based headquarters, and the European Parliament and Council of the EU holding the majority of their meetings 
Title: Institutional seats of the European Union
Content:  The treaties or declarations of the EU have not declared any city as the "capital" of the EU in any form. However, informally the term has found usage despite connotations out of step with the normal perceptions surrounding an inter/supranational entity. Brussels is frequently the subject of the label, particularly in publications by local authorities, the Commission and press. Indeed, the city of Brussels interprets the 1992 agreement on seats (details below) as declaring Brussels as the capital. Likewise, authorities in Strasbourg and organisations based there refer to Strasbourg as the "capital" of Europe  (often wider Europe due to the presence of the Council of Europe there as well) and Brussels, Strasbourg and Luxembourg City are also referred to as the joint capitals of Europe, for example in relation to the "EuroCap-Rail" project: a railway that would link "the three European capitals".
Title: Brussels and the European Union
Content:  Luxembourg (judicial and second seats) and Strasbourg (Parliament's main seat). Authorities in Strasbourg and organisations based there also refer to Strasbourg as the "capital" of Europe  and Brussels, Strasbourg and Luxembourg are also referred to as the joint capitals of Europe. In 2010, then-Vice President of the United States Joe Biden, while speaking to the European Parliament, said: "As you probably know, some American politicians and American journalists refer to Washington, D.C. as the 'capital of the free world.' But it seems to me that in this great city, which boasts 1,000 years of history and which serves as the capital of Belgium, the home of the European Union, and the headquarters for NATO, this city has its own legitimate claim to that title."
Title: 2010 in the European Union
Content: 🇩🇪 Essen, Germany (representing the Ruhr) ; 🇹🇷 Istanbul, Turkey ; 🇭🇺 Pécs, Hungary The European Capital of Culture is a city designated by the European Union for a period of one calendar year, during which it organises a series of cultural events with a strong European dimension.
Title: 2014 in the European Union
Content: Riga, Latvia ; 🇸🇪 Umeå, Sweden The European Capital of Culture is a city designated by the European Union for a period of one calendar year, during which it organises a series of cultural events with a strong European dimension.
Title: Largest capital cities of the European Union
Content:  Note : The cities are sorted by the column labelled Official population.
Title: 2015 in the European Union
Content: 🇧🇪 Mons, Belgium ; 🇨🇿 Plzeň, Czech Republic The European Capital of Culture is a city designated by the European Union for a period of one calendar year, during which it organises a series of cultural events with a strong European dimension.

Question: What is the capital of European Union?
Answer: City of Brussels.
Brussels City.
Brussels, Belgium.
Bruxelles.
Brussel.
Stad Brussel.
Ville de Bruxelles.
02.
BXL.
Bru.
Brussels.
Strasbourg.
Straßburg.
Strassburg.
Schdroosburi.
Strossburi.
Strossburig.
Strosburi.