The National Congress of Argentina is located in Buenos Aires and consists of a 72-seat Senate and 257-seat Chamber of Deputies. It is situated next to Congressional Plaza with many significant artworks and monuments. The Casa Rosada is the official seat of the executive branch of the Argentine government and is painted a light pink color. The Buenos Aires Metropolitan Cathedral located in Plaza de Mayo is one of the most enduring and beautiful buildings in the city. The Teatro Colón is considered one of the top five opera houses in the world for its acoustics.