Dungeon Provincial Park
Dungeon Provincial Park is located on the Bonavista Peninsula near the Bonavista Lighthouse. Its most notable feature is a large hole in the ground with two adjacent caves leading to the sea.
The "Dungeon" formed when the waves began carving two caves into the sedimentary rock on the ocean side. As the caves got deeper they eventually carved out an area that could no longer support the overhead rock. This resulted in the roof collapsing forming the large sinkhole structure and two caves leading to the ocean. Eventually the roofs of the two caves will collapse and form a sea stack.