A Must-Visit UNESCO World Heritage Site in Lisbon.The Jerónimos Monastery (Mosteiro dos Jerónimos) is an incredible display of 16th-century Manueline architecture and a highlights of any trip to Belém. The sheer detail carved into the limestone stone walls, incorporating intricate maritime motifs and national history, is simply world-class.While you can enter the main church for free to see the tombs of Vasco da Gama and Luís de Camões, buying a ticket for the inner cloisters is an absolute necessity. The two-story courtyard is extraordinarily beautiful, especially when the sunlight filters through the arches.Best For: History lovers, photography enthusiasts, and first-time visitors.Pro Tip: Timed-entry tickets must be booked online in advance to avoid the long waiting lines. Try to reserve the first slot of the morning at 10:00 AM to enjoy the cloisters with minimal crowds.