How to create ISO image (from CD) and mount it later

If you have a CD that you would like to make a copy, to keep it exactly as it is you need to make an ISO image.

Do it just with one single command:
dd if=/dev/cdrom of=/some/folder/foo.iso bs=1024

Later to mount it execute it like:
mount -o loop /some/path/foo.iso /mnt/iso