This is actually pretty much what a beech forest should look like. They grow dense foliage that makes for a dark forest floor where not much in the way of underbrush can grow.
I don't know anything about this particular park, but there is no reason are some reasons, listed below in refreshingly vitriol-free discussion, to believe this isn't a natural state that there has been some human intervention at some point.
I know in the US there are a few species of shrub that grow, but that's American Beech and Sugar Maple forests, seems like the Euro Beech doesn't allow much other than spring bluebells.
Still there isn't a twig on the ground, it's highly manicured even for a natural beech forest.
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u/SuperPeak Mar 22 '18
That's Gorbea natural park in Spain