Inside Story: What's the whole of Gyanvapi Masjid?

Kashi, one of the oldest cities in the world, is known for its unique culture. Here Baba Vishwanath is above caste and religion. It is only with the blessings of Baba that the juice of this city remains forever. But the Gyanvapi Masjid is also present in the same premises, just near where Baba Vishwanath is seated.The Hindu side claims about the Gyanvapi mosque that there is a Jyotirlinga under this disputed structure. So what is it, know the whole matter.