Praça do Comércio (Commerce Square) is a large square located in Lisbon, Portugal. It was built after the 1755 earthquake and is one of the city's most important public spaces. The square is bordered by historical buildings, including the former Royal Palace, which now serves as the city's National Museum of Archeology. The square is also home to several monuments, including the triumphal arch known as Arco da Rua Augusta, which was built to commemorate the rebuilding of Lisbon after the earthquake. The square is a popular gathering place for tourists and locals alike, and hosts various cultural events and festivals throughout the year.