The Sand-covered Church

Interesting historical landmark. It's free and you can climb up to the rafters and enjoy the view. Nice walking trails in the surrounding park as well.

The car park is quite close to the church. About 5 minutes walking. The church itself isn't completely buried as most of it has been demolished. However, the tower that still stands is accessible and there are stairs that allow you to climb to the top. Good views from up there.