Museu do Dinheiro (Money Museum), located in the restored Church of São Julião in Baixa, offers an interactive look at the history of money in Portugal and around the world.

The museum traces the evolution of currency from barter systems to modern banking, with exhibits of coins, banknotes, and interactive activities like minting virtual coins or designing banknotes. Visitors can also see archaeological remains, including part of the medieval city wall, and even touch a gold bar.

Just steps from Praça do Comércio, it's a central and free cultural stop that fits easily into a relaxed walk through Lisbon.