Brian Paco Alvarez, a Vegas native that operates his own tour guide business, Fabulous Story Tours, talks about the marble used in an office building at 520 S. 4th Street while walking along one of his tour routes in downtown Las Vegas on Tuesday, March 17, 2020. Nearly all of Alvarez’s upcoming tours have been canceled in the wake of convention cancellations and travel restrictions because of coronavirus. (Chase Stevens/Las Vegas Review-Journal) @csstevensphoto