I have said it a hundred times, and I will say it again now...there may be no challenge greater than to enter a structure of any kind, unseen, unplanned, and just praying I could make a great photo out of what is presented. This recent challenge came out terrific... but much of the word terrific can be found in the word terrifying! Light is light, and two things are really needed. Light you can work with, and then, working well with the light. This is a great exampe of what can be done with existing light, exposing correctly, having high quality lenses, a good dose of skill, and a pinch of luck!