Kahlenberg, the tallest of Vienna’s landmark hills, is not only perfect cycling territory; right at the top it has the largest treetop climbing center in eastern Austria. 150 obstacles divided into three levels of difficulty and reaching dizzying heights of up to 20 meters ensure that the fun never ends. Adventurous souls can also be seen zooming through the air on flying foxes while they lap up the breathtaking views of the city in the distance. And after all that physical activity, the neighboring Josefinenhütte offers welcome respite with classic local and seasonal dishes and a charming interior.