The National Theatre of São Carlos is a prominent opera house located in Lisbon, Portugal. Opened in 1793, it is renowned for its neoclassical architecture and serves as the main venue for opera performances in the country. The theatre has a rich history and has hosted numerous famous productions and artists over the years. The theatre was named after King Carlos I and has undergone several renovations to preserve its grandeur. It is home to the Portuguese National Opera and plays a vital role in promoting the performing arts in Portugal. Visitors can enjoy a variety of performances, including operas, concerts, and ballets.