Water Eaton Grain Silo, Oxfordshire, October 2011.
I accept this is not a new place to be explored at all, but it was my first explore, done spontaneously.
A friend and I went at the crack of dawn and watched the sunrise from the roof, the view is wonderful.
After 30 years of disuse, there's a hell of a lot of pigeon poop and graffiti! To my knowledge, the fire service have been called out to two fire calls since then, both on the lower floors.
I have to say the most impressive thing about this explore was the enormity of the silos themselves, running the whole height of the building. We dropped a small pebble into one, and a lengthy six seconds later we heard the clunk!
I wish to return, this time with a tripod (schoolgirl error!), and perhaps a flash head. Hope this is a decent first report!