This wonderful science museum occupies a centuries-old former monastery converted by Pombal into the university’s chemical engineering building. It features intriguing state-of-the-art interactive science displays coexisting with 18th-century lab sinks; don’t miss the giant glowing globe in a room paved with medieval stones, or the psychedelic insect’s-eye view of flowers. Displays are in English/Portuguese. There's also a great cafe with terrace and views down to the new town. A combined ticket including the Velha Universidade costs €9, a €2 saving.