Without doubt, Lower Austria counts among the most fascinating culture landscapes of Middle Europe. With the Semmering railway and the Wachau valley, already two UNESCO world cultural heritage sites are to be found in the vast country around Vienna. Numerous are the art treasures in more than 600 collections and museums and in 15 monasteries. Impressive are the traces left by the rulers of the long history of Lower Austria: from the Roman Carnuntum to the castles and chateaus of the Babenberger and Habsburger and their lieges to the modern architecture of the governmental district of St. Pölten. Following the traces of nature is possible in the two national parks Donau-Auen and Thayatal and in the 22 nature parks of Lower Austria.