Denver is building a huge transportation hub around its old Union Station. There are estimates that they will get 100,000 visitors daily once it ramps up. The huge underground bus concourse just opened yesterday.
So I stepped into the bus concourse this morning and had zero service. No LTE, no 3G, no 1x, no signal. I watched as I walked the long concourse and saw a 3G appear for a couple of seconds before it disappeared again.
I suggest you get some folks down there to check it out!