The Dohány Street Synagogue or Great Synagogue (Hungarian: Dohány utcai Zsinagóga/Nagy Zsinagóga, Hebrew: בית הכנסת הגדול של בודפשט) in Budapest is the largest synagogue in Europe and the second largest in the world, after the Temple Emanu-El in New York City. It seats 3,000 people and is a centre of Neolog Judaism.
The synagogue is 75m long and 27m wide and was built between 1854 and 1859 in the Moorish style, based chiefly on Muslim models from North Africa and Spain, according to a plan by Ludwig Förster, with interior design partly by Frigyes Feszl. (source: wikipedia)
More photos of the Synagogue you can find here.