Since apparently one Italian-themed casino and hotel isn′t enough for Vegas, the owners of the famed Venetian Hotel went ahead and built a sister hotel, the Palazzo. What′s cool about the Palazzo is not necessarily (Okay, not at all) its look, but the fact that this massive building (combined with the Venetian, it′s the largest hotel in Vegas) is LEED-certified. This kind of large-scale project is the step in the right direction for making sustainability a standard consideration in building. You know what else is cool about the Palazzo? The fact that I won a poker tournament there. I guess Lady Luck digs green architecture too.