We did when we were living in Saudi Arabia. We INTENDED on going to "those places" that we wouldn't visit in a MILLION YEARS when we got home, so we went then.
ALL real pit holes.
I DID think that Mexico was THE filthiest place in the world, then the middle east, then India, then Africa. Out last place to visit was China.
CHINA won the "FILTHY" award HANDS DOWN.
Wow! I'm shocked.
I’ve heard (from missionaries) that the dirtiest part is the very air one has to breathe in urban areas. They came back to visit their families for the holidays and did laundry. The parkas they wore everywhere (colder northern China) had to be washed five or six times before the discharge water wasn’t filthy and stinking.
Among the top ten bad things was that parents still allowed their children to defecate in public. Evidently, when they sense their kids need to go, they just let them drop trou and go where they are, wherever they happen to be.
When in China, watch where you step ... if you can see past all of the smog!
You apparently have not been to Pakistan.