The Ruined Mansion's Mirror

Sitting outside the city of Toulouse is a ruined mansion built in a fashion advanced by 9th Century standards. Highly carved & intricate woodwork is found throughout with much stonework on the outside. Glass panes in the windows are of the highest standards. Originally held by the Ramnulfids family, a minor noble family of lords & ladies, but rising quickly in the Frankish Empire.
What many don't realise is that in the centre of the house stands a huge mirror. Exactly who created, or even commissioned it is unknown. What anybody can tell, is that it gives off a strange otherworldly feel, and eerie vistas are able to be viewed. These cannot be explained, but the mirror gives off magical energy when a Detect Magic spell is cast on it.
These vistas range in nature showing many many different environments, usually of natural environments with the ruins of past empires present.
One theory is that the mirror has passed through many of these ancient empires and their destruction or end has been imprinted on it. Given the mature of this it would explain the reason the Ramnulfids family gave up the house. The sense of despair that surrounds it can be palatable and the longing for what was once glorious now turned to naught ever present.
Where they got the mirror has never been fully explained, but whispered to have been bought on the black market, or gifted to them by the le Marchand family. The same whispers say that when it was installed, the house itself was built around it, and was also designed by the le Marchands, and when the Ramnulfids moved in, they started to notice changes over time. These seemed to be damage to the structure of the house, as if it was being destroyed by nature a piece at a time. Cracking of stone, splintering of wood, water & wind damage, and even damage by the sun was all noticed. Usually consigned to small areas no more than a few feet across, the need to spend more & more resurces to the property became to much and so they left.
Over time, plant life, and the odd animal has started to do damage now, leading to it becoming even more structually unsound. Those that visit it or explore within are soon forced to leave with the eerie feeling that they are being watched. Most who do say it as if the mirror holds sway here, and nothing or no-one else does. This has led to the Ramnufids to seek anyone who can work out what is causig it and either destroy it, or if nothing else, take the land for a relatively cheap cost of 5000 gold.

"I've never heard of that place. We probably would have robbed it during it, and after. But that story you've just told me? No bloody way. I'll let the Guild down there in Touluos to avoid like St Justinian's Plague."
Floki the Tramp speaking to a traveller in the Slinky Siene.