Sea stacks are blocks of rock that have been isolated from the land by sea. Sea stacks begin as part of a headland or sea cliff; over centuries, relentless pounding by the waves and wind erodes the softer, weaker parts of the rock, leaving behind free-standing vertical formations that are amazing to behold. Eventually, the same process that created the sea stacks will also cause them to collapse.
Luckily, there are still many awesome sea stacks out there for you to visit, photograph, ponder over or attempt to climb. Here are 13 of them. Send us pictures of more!