Planetarium (Planetário) Calouste Gulbenkian
Designed by architect Frederico George, the Planetarium Calouste Gulbenkian first opened its doors on July 20th 1965. The sixties' style exterior and decor can look a little dated even after a recent refurbishment. That said, if the scheduled shows fit into your plans and you're interested in astronomy, then the Planetarium is well worth an hour of your time. Check their website for dates and schedules. A few shows require pre-booking, and not all are in English.