Look at the size of these doors
I believe they once housed giant people
HE shut the doors
The End

The underground of the Vatican is famous for its secret corners and deep holes as well as the underground beneath Prague. Are all over the world.

I knew the French Legion mercenary who was in Afghanistan. He told me about giant in the rocks with red hair. Those who found it were Americans and he killed most of them. The others who survived were gradually silenced so that they would not speak. He knew this from a friend of those who took part in the mission (no one in the leadership told them what was in those mountains and why they were sent there, said it was a shock to them, they were just supposed to secure what they could find.) and those who were saved became scum for the American/Britain government for life and were persecuted. These giants hibernating and some have been waking up on their own in recent decades.

Another are reptilians. People still don't believe in it and think it's just a fairy tale. The height of the door height would also correspond to their height.