I found this topic not mentioned. There are some Islamic resources that said about the existence of two cities: one at the very west of the earth and the other at the very east. It was reported that the only human beings able to go there were some from the `Ad tribe. This may sound mystical to some but I found it very interesting. You can watch the video link below about the two cities.

https://youtu.be/PDRV0g4m4GQ