This is my submission for this challenge: https://dailypost.wordpress.com/dp_photo_challenge/broken/
The following photo is of a natural bridge at Natural Bridges State Beach in Santa Cruz, CA. It is the only one remaining of three natural arches carved by the sea into a cliff over a million years ago. As you can see, the waves show no mercy on this natural structure. The outermost arch fell down in the early 20th century, and the innermost one collapsed in 1980. It is expected that the remaining arch will also break down eventually, perhaps sooner than we think.