Location from Harry Potter by J.K. Rowling
The most secretive department in the Ministry of Magic, located on the lowest level, containing rooms devoted to the study of love, death, time, space, thought, and prophecy.
The Department of Mysteries is where the Ministry studies forces it cannot control or fully understand. The Unspeakables who work here are the wizarding world's closest equivalent to theoretical physicists, except their subjects can kill you in ways physics can't. The Hall of Prophecy stores every prophecy ever made in Britain — including the one about Harry and Voldemort that triggered the Battle of the Department of Mysteries. The Death Chamber contains the Veil, an archway through which Sirius Black fell and never returned — whether it leads to actual death or somewhere else is one of the Department's unanswered questions. Harry could hear whispers from behind the Veil. Luna could too. The Time Room's stock of Time-Turners was destroyed during the battle. The Love Room is always locked, which Dumbledore considered the most significant detail about the entire Department.
A series of dark, circular rooms accessed by a plain black door at the end of a corridor on Level Nine. The entrance room spins to disorient visitors. Beyond it: the Hall of Prophecy (towering shelves of dusty glass orbs), the Brain Room (a tank of floating brains trailing tentacle-like thoughts), the Time Room (clocks everywhere, a bell jar where a hummingbird endlessly ages and de-ages), the Space Room (darkness filled with planets), the Death Chamber (a stone amphitheater containing an ancient crumbling archway with a fluttering black veil), and the locked Love Room.
Also known as: the Department of Mysteries, Department of Mysteries, the DOM