Hacking the city

City map on unstretched canvas, New York, January 2020

Do you see modern cities as a sanitized area nowadays, with draconian restrictions on the places that we are allowed to go? 
Bradley Garrett is a place hacker and an urban explorer: he tries to push the absolute limits of where he would go, be it underground or to the very top of the highest skyscrapers.
His book "Explore Everything: Place-Hacking the City" offers a comprehensive insight into the current urban exploration scene.
Let's start to explore via these imagined subterranean structures.