IOWA CITY — If you’ve strolled down Iowa City’s Linn Street, near Devotay Restaurant & Bar and La James spa and salon, a fascinating piece of the community’s history has been right under your feet. And a group of researchers want you to know it. So on Monday, crews lowered laser-scanning technology down a 25-foot-deep hole to take 3-dimensional images of Iowa City’s historic beer caves in hopes of creating a virtual reality of the hidden landscape.