holes

The Well of Barhout (also nicknamed Well of Hell) is a sink hole in Al-Mahara, Yemen. It is about 30 m (100 ft) wide at the surface, and 112 metres (367 ft) deep. ... https://en.wikipedia.org/wiki/Well_of_Barhout SOURCE...

Reading the thread on humans buried in concrete reminded me of a story I heard when I was a kid. I lived on a crossroads and I was told by several people that in the early years of the 20th century a house and cart had just turned one of the corners when the ground just opened up beneath them...

trepanation Can anyone put in touch with some good resources about trepanation (or trephination)? I can't be the only one interested in this subject, and I figured this site was a good place to ask. I am especially interested in modern used (the who what when and how of it) but also in...