This is a lovely route to run in Slovakia. Its through the Dúbravská hlavica, a lovely forest on the outskirts of Bratislava. One of the highlights is the abandoned buildings of a former Soviet observation site that you can explore.
Some of the old buildings
At the top of the mountain (hill) is that steampunky observation tower that you can climb up. Its probably about 3 stories high, and quite scary looking down through the thin walkways. But worth it for the view.
Finally, here is the route I ran.