Rossio Square is worth passing through for a few pics when in Lisbon City Center. Our travelers also like this historical area for its riverfront setting.
If you want to give your credit card some exercise, head out to Avenida da Liberdade, a popular place for shoppers in Lisbon City Center. It's also full of great shops and restaurants, so you can spend the afternoon having a wander. Splash some more cash at Rua Augusta, Amoreiras Shopping Center, and Mercado da Ribeira.