The city is known for hosting the 1992 Summer Olympics as well as world-class conferences and expositions and also many international sport tournaments.

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In 1794, this fortress was used by the French astronomer Pierre François André Méchain for observations relating to a survey stretching to Dunkirk that provided the official basis of the measurement of a metre.

The definitive metre bar, manufactured from platinum, was presented to the French legislative assembly on 22 June 1799.

by the marriage of Ramon Berenguer IV and Petronilla of Aragon, their titles finally borne by only one person when their son Alfonso II of Aragon ascended to the throne in 1162.

His territories were later to be known as the Crown of Aragon, which conquered many overseas possessions and ruled the western Mediterranean Sea with outlying territories in Naples and Sicily and as far as Athens in the 13th century.

Important Roman vestiges are displayed in Plaça del Rei underground, as a part of the Barcelona City History Museum MUHBA; the typically Roman grid plan is still visible today in the layout of the historical centre, the Barri Gòtic (Gothic Quarter).

Some remaining fragments of the Roman walls have been incorporated into the cathedral.

The cathedral, also known as the Basilica La Seu, is said to have been founded in 343.

The city was conquered by the Visigoths in the early 5th century, becoming for a few years the capital of all Hispania.

Another common abbreviation is 'BCN', which is also the IATA airport code of the Barcelona-El Prat Airport.