I saw this today. I would love to go here and take pictures. http://www.mazury.info.pl/atrakcje/kanal-mazurski/ It's an abandoned Nazi fort in the wood of Poland. That's like 75 years old. Exploring it would be exciting as hell. Can you imagine, if that site in Cuba is any kind of human construction, just how freaking old it could be? You could find something that would totally rock your shit. The possibilities are endless. In this clip https://www.youtube.com/watch?v=cx6EnpEF26A He is talking about a pyramid they found that is very big and very old. They are excavating it now. A lot of stuff is being discovered right now. It is bound to challenge some dogma. It's good to be skeptical, but facts are inconvenient things. Maybe people should be more skeptical about the bullshit they have been taught. It's a big universe.