By Daniel Kline It has been a very long journey for the property but there are signs that construction has moved into high gear. While the Las Vegas Strip contains some of the most iconic hotel/casinos in the world, it also has its share of failures. Nearly every major property sits on the site of a once-iconic brand that outlived its day, became dated, or just lost out to the glitz and glamor of whatever new mega-resort casino gets built. In just the past few months, we’ve learned that the Mirage, which was built in 1989, will soon make way for a Guitar Hotel after MGM Resorts International (…