The Sightless Pit is a medium-sized Dwemer ruin in Winterhold, located south-east of Saarthal and west of the Shrine of Azura. It is infested with Falmer, chaurus, frostbite spiders and the odd skeever. The entrance is quite literally a pit into which one must jump.
A small camp with three bed rolls also unearths three dead bandits who apparently did not survive a confrontation with the Falmer.
Temple of Xrib
A Staff of Daedric Command can be found here.
This is the exit of the Sightless Pit.