MariZ said:now I realized that it could be similar feeling like the one at the cave I once visited.
It's called "Strašna Peć" at Dugi Otok (Croatia) http://strasnapec.com/ (http://www.dugiotok.hr/atrakcije-strasna-pec), my experience was thrilling with some kind of "energetic boost" that I've felt afterwards(I do have some experiences with energetic work while doing reiki practise).
It was very refreshing feeling for the body with fresh air streaming from the tunnels of the cave and many cool stuff we heard from our tour guide.
Sounds and looks interesting. Like I said, the tunnels may not be necessarily connected to the pyramids. For example, I feel energetic boost in the summer before a strong storm. Maybe the tunnels/caves simulate the same phenomenon.
Here is another testimony: https://www.youtube.com/watch?v=cMWjOBptzWw
Probably by visiting this tunnels at Visoko, the feeling is even more sensational so I'm gonna go for it,and will be posting a feedback here. :)
Please do, if you decide to go. ;)