Here is another good secret places sort of blog, zine, personal web page: Infiltration from the city Canada loves to hate, Toronto. From the ethical statement:

...I don't think there is anything wrong with urban exploration, at least not the type described here and on 95 percent of the other sites on the Internet, and I can't pretend I do. Genuine urban explorers never vandalize, steal or damage anything — we don't even litter. We're in it for the thrill of discovery and a few nice pictures, and probably have more respect for and appreciation of our cities' hidden spaces than most of the people who think we're naughty. We don't harm the places we explore. We love the places we explore...