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The biggest and most traditional, in Italian opera-house style, featuring opera and classical music, but also more modern pieces.
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Theater and music museum.
School of the Jesuits, in a Baroque building.
At the "Ex Rectorado" (now Facultad de Derecho), will show the university's history.
This museum has a large and eclectic collection. It has an impressive collection of fossils including the fossil of the greatest pre-historic spider of the world but also has a zoology section a mineralogy section and considerable space devoted to Charles Darwin and the voyage of The Beagle including an original edition of the Origin of the Species given to the National Academy of Sciences by the author.
Very fine Baroque colonial building from the 18th century with a museum and a beautiful cloister. Nowadays part of the university's faculty for law studies. The cloister is open to the public and tours of the building are available.
The probably biggest attraction of the Manzana de los Jesuitas quarters, this is the oldest standing church of Argentina, built in 1671.