Why are archaeological sites often found underground?

Question

What caused them to go “underground”?

In: 3

Answer 1

Just note that a lot interesting structures and items would have been high in the air, but those are not there for obvious reasons. That would be too exposed to weather and people to stay in place. The only things remaining is things that have been protected by being underground. That is the only things we are able to still see and make archeological studies of.