There are three tablets and an altar at the end of the projection room, under the movie screen.
The tablets read: THE CHAMBER OF EARTHLY RICHES / WEALTH BEYOND YOUR WILDEST IMAGINATION LIES WITHIN AND IS YOURS FOR THE TAKING BUT BEWARE THE EYES OF MARA / THE OBSERVATORY OF THE FUTURE / THE FOUNTAIN OF ETERNAL YOUTH / ONE SIP FROM THE ETERNAL SPRING SHALL RENEW VIGOR AND YOUTHFUL SPIRIT BUT BEWARE THE EYES OF MARA / BEHOLD THE AMULET OF MARA AND YOU SHALL SEE VISIONS OF THE FUTURE BUT BEWARE THE EYES OF MARA