It's difficult to see with the photo at this size, but the sign painted on the cliff reads "VIrGIN MAry-SHrINE"
The shrine consists of two buildings plus a structure apparently symbolizing a fishing net.
Update: Cora and hkneale inform me that the fishing net-like structure in the right hand picture is in fact a giant rosary. It's visible in the right hand photo at the top layer.
The buildings contain the offering areas, with notebooks where people have written memorials to their dead.
A few more photos at the flickr.