Travelers are voting Vienna Volksoper, Undine Fountain and District Fountain as the best of 9 key buildings in Vienna. There are 2 key buildings in Rust a city just 31 km from Vienna and 5 key buildings in Sankt Pölten which is 33 km distant. The most popular of these are Undine Fountain in Rust and District Fountain in Sankt Pölten. You can find 66 Key Building in the country of Austria and Adlerbrunnen is our members favorite Key Building in all of Austria. Want more? Check out our map of key buildings in Vienna.