The Tower of Belém has become one of the most famous sights of Lisbon. Torre de Bélem (original name) is in good condition, also the location of this tower is very unique.
The tower dates from the 16th century and is a tribute to the explorer Vasco da Gama and the Portuguese Century. This tower served as a defense tower on the banks of the river Tagus.
If you would like to take pictures here I would advise not to visit this place during afternoon. Because it is quite busy there. Better go during the morning or at sunset.
October to May: From 10.00 a.m. to 5.30 p.m.
May to September: From 10.00 a.m. to 6.30 p.m.