In 2026, Lisbon is a "Sunday-friendly" city for tourists, but with some notable exceptions. Most major tourist attractions (like the Jerónimos Monastery, Belém Tower, and Saint George's Castle) remain open on Sundays, though they are often very crowded as it is a popular day for locals to visit. Shopping malls (like Colombo or Vasco da Gama) and supermarkets are also fully operational on Sundays, often staying open until midnight. However, many small, independent shops and traditional family-run boutiques in the Baixa and Chiado districts may close for the day. In the restaurant world, Sunday is a common "day off" for some high-end or local tascas, but you will still find plenty of options open in the more central areas. A key tip for 2026: museums that were once free on Sunday mornings often now require a "Lisboa Card" or a paid ticket for non-residents to manage capacity, so always check the latest visitor policy before heading out on a Sunday morning.