At the center of this is the Matthias Church, you may find it odd that the bastion surrounds it and that is actually because during the restoration and redesign of the church, the bastion was being built and it incorporated the church within its design.
Be sure to come during the day and night for a different view of the surrounding areas as well as the Bastion itself. The Bastion is actually open all year round, day and night and is free! You only need to pay if you want to go up the turrets.
Come visit again next Monday for another Future Point of Interest!