As electronica music plays in the background, a cell phone video quickly pans over the ivied cloisters, abandoned chalkboards — “Open this as a homeless shelter,” someone has scrawled — and graffitied sanctuary of the former Cathedral High School in Denver’s Uptown.

The TikTok video , which has 37,000 likes, was posted in March by urbex, or urban exploration, trespassers. Below the video, fellow urbex hobbyists recounted their arrests there.

“I went to this place when it was more recently abandoned a year ago and it was so pretty before people started doing stuff to it,” one lamented about vandalism at the site.

Last month, the City of Denver fined GFI Development of New York $140,000 for allowing the property at 1840 Grant St. to become a magnet for vandals, vagrants and the very cur

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