As you stroll around the Baixa area, don’t just settle for what you can see at the city’s surface. Prepare to discover the various past lives of Lisbon by climbing down to the Núcleo Arqueológico da Rua dos Correeiros, where you’ll find the remains of previous occupants of the city and can see the various overlapping structures from periods ranging from the Punic to the medieval and Pombal era. With guided tours of 45 minutes that help you understand more than 2,500 years of history and identify the various stages in the life of the city, this is a genuine dive into Lisbon’s history. If you want to explore this underground part of Baixa by yourself, you can free of charge.