HOMER, Minn. — A caretaker reported intruders prowling around the abandoned twin Briarcombe mansions off Knowlton Lane behind the Bridges golf course. Deputies found kids engaged in the dangerous game of “urban adventuring,” as it’s called . This was about 10;30 p.m., long after dark. Deputies rounded up the intruders, all teenagers, and called their parents. The once-glorious mansions, now 114 years old and long vacant, have been occasional magnets for thrill-seekers and relic-collectors despite posted no trespass warnings.