Inaugurated in 1904, this Modernista observatory is still a functioning scientific foundation. It can be visited on certain evenings to allow people to observe the stars through its grand old telescope. Visits, generally in Catalan or Spanish (Castilian) have to be booked. From mid-June to mid-September an option is to join in for the nightly Sopars amb Estrelles (Dinner under the Stars).
You dine outside, tour the building, peer into the telescope and get a lecture (in Catalan) on the heavens. The evening starts at 8.30pm and costs €70 per person. The easiest way here is by taxi.
