The Bay of Fundy has the highest tides in the world, and the tide ebbs and flows at twenty miles per hour. The continual surge of fast water erodes the rocky shores and leaves freestanding "flowerpots" with full-sized trees growing and the top.
For a few a hours surrounding low tide, you can walk on the sea floor. People pile stones into cairns here to mark their presence. I've seen similar cairns at the Sedona vortexes, at the Block Island labyrynth, and at Thoreau's cabin site at Walden Pond.
This block of concrete, probably an old mooring block, is covered with cairns.
The Hopewell Rocks, referred to locally as "flowerpots" because of the flora on top, look to me like muffins when exposed by the ebbtide.
My brother is dwarfed by the bases of the Hopewell Rocks.
We stayed in a chalet in the National Park after a supper of seafood chowder in the nearby village of Alma.