Had a quick visit to the Church on a recent visit to Prague. They close at 5pm on weekdays in summer and I got there with 30 mins to look around. They had some nice displays relating to the group of soldiers that were involved with the assasination. It was a very sobering experience to go into the crypt where they held out for a few days before taking their lives as they were about to be taken prisoner by the nazis. Would have liked to had more time to read through the displays. I would highly recommend if visiting Prague and you have an appreciation for history.