The Teatro Nacional de São Carlos is an opera house located in Lisbon, Portugal. Opened in 1793, it is renowned for its neoclassical architecture and has a seating capacity of around 1,200. The theater primarily hosts opera performances and is the main venue for the Portuguese National Opera. Throughout its history, the theater has undergone several renovations, particularly after a fire in 1914. It features a beautiful interior with ornate decorations and a grand chandelier. The Teatro Nacional de São Carlos remains a cultural landmark, attracting both locals and tourists interested in the performing arts.