National Museum of Natural History and Science Lisbon
Visit the Lisbon Science and Natural History Museum. Part of the University of Lisbon, their aim is to "promote curiosity and public understanding of nature and science". Which is something that the Museum definitely succeeds in with collections spanning more than 250 years, focussing on areas such as Zoology, Anthropology, Geology and Botany. If you are interested in having a little walk through time then this is well worth a visit.
IMAGE - By Jsobral - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=10368447