AROUND THE WORLD
I'm not sure about you but I hate confined spaces, even when having medical tests like Pet and Cat scans. However, others seem to love these spaces. The recent rescue of the Thai soccer boys left me gob smacked. Anyway, check out these hidden spaces from around the world. Many have revealed hidden secrets of life in the past.
Clancy's comment: Mm ... Not for me, unless I can see daylight. What about you?