Image by Carlos Sanchez Pereyra Getty Images
Inaugurated in 1904, this Modernista observatory 415m above sea level is still a functioning scientific foundation. On certain evenings visitors can observe the stars through its grand old telescope (check the website for the latest schedule). Visits, generally in Catalan or Spanish, must be pre-booked. From mid-June to mid-September, Sopars amb Estrelles offers an evening of high-end dining and astronomy.