Why do so many ancient cities, especially the big ones, have dissapeared geographically after being abandoned? If nobody destroys them, shouldn’t the structures and general architecture remain intact?

Question

Why do so many ancient cities, especially the big ones, have dissapeared geographically after being abandoned? If nobody destroys them, shouldn’t the structures and general architecture remain intact?

In: Other

Answer 1

Quite often Citys are also build on top of other citys.
What once was a good place to settle down will most likely stay one unless the environment changes drastically.