Μake us preferred on GoogleThe Thissio Visitor Center of the National Observatory of Athens is inviting visitors to experience the night sky through its English-language evening tours, taking place every Wednesday, Friday and Saturday throughout August. From 5 to 29 August 2026, English-speaking tours begin at 10:00 p.m. and last approximately 70 minutes. Located on the Hill of the Nymphs, opposite the Acropolis, the Thissio Visitor Center occupies the historic Sina building, the first home of the National Observatory of Athens. The Geoastrophysics Museum visit continues as normal. Smoking and the consumption of alcoholic beverages are prohibited throughout the National Observatory’s premises, and access to the Visitor Center is available only during scheduled public tours.