Dark Tower

   Built at the express insistence, and to the specifications, of Salazar Slytherin no less, this edfice is a funnel and magnet for Dark might, its very array of stonework and choice of materials solely designed to harness every drop of chthonic choler swirling in a miasma around this bulwark and bastion of bravery that is Hogwarts. Ostensibly, this is to drain, and harmlessly dispose of, the wrath and cloth of evil, but given Slytherin's other surprises elsewhere in the school, who knows what time spent here might do, or trigger, or. . awaken?

Salazar's standpoint
How its original master saw this place.