Architectural Photography - Marin Headlands

I have been waiting for the perfect chance to share this photo. This is some old military structure at the Marin Headlands in California. The geometry of it sucked me right in. So here is my first entry in @photocontests with #architecturalphotography. It's such a mystery to me that ma made structures can have so much soul. Even these fairly bland concrete ones.

All my pics are taken with my iPhone6s.