Explore the urban wilderness of Madrid, Spain, with our curated list of crowdsourced urbex spots. From the gritty, graffiti-covered streets of the city center to the abandoned industrial sites on the outskirts, there's no shortage of hidden gems waiting to be discovered. Our list includes everything from the iconic, Instagram-worthy spots to the lesser-known, off-the-beaten-path locations that will give you a unique perspective on this vibrant city.