With only 24 hours in Lisbon, you should focus on the city's historic core and the riverside charm. Start your morning in Alfama, the oldest district; wander its narrow, winding alleys and catch the iconic Tram 28 for a scenic (if crowded) climb to the São Jorge Castle for panoramic views. For lunch, head to the Time Out Market (Mercado da Ribeira) in Cais do Sodré to sample dishes from the city's top chefs under one roof. In the afternoon, take a short tram or train ride to Belém to see the UNESCO-listed Jerónimos Monastery and the Belém Tower. Crucially, you must wait in line for an original "Pastel de Belém" custard tart—they are worth the hype. As evening falls, return to the city center for a sunset at a "Miradouro" (viewpoint), like Santa Catarina. End your night with a traditional Portuguese dinner in the Bairro Alto or Chiado districts, accompanied by the soulful, haunting sounds of live Fado music, which is the emotional heartbeat of Lisbon's cultural identity.