They're breaking into abandoned buildings like the Gates Rubber Company, where a teenage girl fell through the roof this past weekend and wound up badly injured. In steam and transportation tunnels under the city. At old missile silos. And definitely at what's left of Stapleton International Airport.
This week, demolition started on the old parking garage at Stapleton, on land that will one day become a housing project. That leaves little above ground beyond the old control tower, which is going to stay as a landmark, but has yet to find any other purpose.
Except, perhaps, as an object to explore? After I wrote about the Gates accident, I received copies of the photos below and a note that the urban exploration will continue.
More from our Calhoun: Wake-Up Call archive: "Union Station redevelopment will close off the tunnel, but not the memories."