Vienna, Austria's capital city, has a population of about 1.7 million people. It is located in northeastern Austria on the Danube River, bordering the Czech Republic, Slovakia, and Hungary. Vienna has a moderate oceanic climate with warm summers and cold, snowy winters. Major tourist attractions include the State Opera, St. Charles' Church, Schönbrunn Palace, and the giant Ferris wheel in the Prater amusement park.