It's amazing what mother nature can accomplish all on her own.
This is a door I stumbled upon while out on walk with my wife at Cavallo Point in Marin. It's from the Battery Yates, located at Fort Baker and built in 1903.
It looks gallery worthy. You've got rusted bolts and corrosion caused by years and years of salt air. That combined with stenciled type layered on older stenciled type with faded out graffiti. I also love the welded door hinge that is keeping history locked up behind its closed doors. If only this door could talk.
As the weather warms up, I encourage you to get out there and explore and keep your eyes open for nature's next masterpiece.