As old Colorado disappears, one historic building at a time, the nonprofit group Colorado Preservation, Inc., has fought to save some special but endangered places, spaces and buildings by highlighting a few of them each year. On Thursday, the group released its latest batch of five. The 2024 list of Colorado’s Most Endangered Places includes a group of 19th-century Catholic churches in the San Luis Valley; a huge and vacant power plant that some community members are trying to save in Denver’s Sun Valley neighborhood; and a small bowling alley in the old mining town of Victor (near Cripple Creek) that maintains its rare manual pinsetters. “This year Colorado Preservation, Inc.