When I cannot go out and about I enjoy reading and research. I have all of the books I can find on urban exploration, but last year I discovered two books that piqued my curiosity:
A Burglar's Guide to the City and
Underground: A Human History of the Worlds Beneath Our Feet.
I spotted
A Burglar's Guide to the City while waiting on a friend in a local library. After reading a few pages I decided to buy my own copy. Don't let the title fool you, it's an entertaining history and study of how people hack architecture. It was published in 2016, and is a decent selection for the urban explorer. Don't worry, it's not a how-to manual.
Underground: A Human History of the Worlds Beneath Our Feet, published in 2018, is for anyone who loves being in subterranean places from caves, tunnels, subways, et cetera.
Both both books are interesting reads. Hope you enjoy!
Front covers
Back covers