andaz liverpool street is built on the site of the bethlehem hospital which housed the mentally ill .
dating back to 1247 , most people will know the institution by the name ` bedlam '
these days it 's a swanky celebrity-baiting hotel with 267 rooms and celebrity guests including beyonce and lil kim .
four of the king rooms are decorated with mesmerising murals created by artists .
hotel hosts a candlelit dinner in its 1901 restaurant once a month .