http://www.switzerland-trips.com/Zurich/Zurich-attractions-activities.html

http://en.wikipedia.org/wiki/Urania_Sternwarte

http://www.immoblick.ch/Panorama_Stadt_Zuerich_Urania.82.0.html

http://commons.wikimedia.org/wiki/File:Urania-Sternwarte_Z%C3%BCrich_-_Werdm%C3%BChleplatz_2010-12-03_18-53-24_ShiftN.jpg

http://www.vac.ethz.ch/index.php/2009/07/impressions-from-urania-observatory/

http://www.tripadvisor.es/Attraction_Review-g188113-d244438-Reviews-Urania_Observatory-Zurich.html

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Urania Sternwarte