The rundown tunnel.

Snuggled up between two larger precipices of rock, the disabled tunnel gives off the illusion of being something long forgotten by those who had built it. Upon an even closer inspection, you are able to note that while those who made it have most likely abandoned it, a new individual or group has seized the opportunity to take it up as their habitation. This is all you're able to grab from the simple surroundings of the tunnel, the only way to ascertain more is by entering the tunnel.