Mt.Gox was Magic the Gathering online eXchange, traded cards before trading Bitcoin.
That blew my mind!
The exchange platform is famous for his big hack which is called "The big bubble of 2011".
---> more information about the big hack: https://www.wired.com/2014/03/bitcoin-exchange/
---> informations about the newest hack of NiceHash worth 64million$: https://www.theguardian.com/technology/2017/dec/07/bitcoin-64m-cryptocurrency-stolen-hack-attack-marketplace-nicehash-passwords