Using a simple mount command, you can mount an iso image and navigate the file system.
First, create the directory you want to use to access the iso. This can be any directory.
$ sudo mkdir /mnt/iso
Then, mount the iso.
$ sudo mount -o loop ~/isos/test.iso /mnt/iso
This mounts the iso file to the mount point you just made. The squiqqly line in Linux ~ means is expanded to your home directory.