I had heard very little about the caves beforehand, but was surprised by the size of the complex and the artwork therein. We took the train, and the local guide was very good with the explanations for the origins, the war years, the cold war years, and the more recent artworks. As previously commented by another, it is very difficult to take photos as the train doesn't stop much. Nevertheless I got a couple of good shots to remind me of an interesting site.
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