Well worth a visit. Just line up at your reserved time slot and show your Klook booking code to enter. The monastery is where monks prayed for Vasco da Gama after he set sail from Belém, and it also served as the living quarters for the monks. Although only a section of the monastery is open—walking around the square courtyard to see the Manueline stonework, azulejo tiles, and ancient tombs—it is deeply impressive and great for photos. The architecture is covered in nautical elements like seashells, ropes, and anchors, echoing the stories of the Age of Discovery. The neighboring church is free to visit, but from the outside, there are two different lines to wait in. Around 1:00 PM is when it is least crowded, and you no longer have to wait in line for the church.