When you fill your tank before a road trip, do you ever stop to think of all the cool things you can see with just that one tank of gas? All I can usually think of, is how far is that tank of gas going to get me, before I have to fill up again. For the fourth largest state in the country, it doesn't take much to burn through a tank of gas.  But, Conoco and Now This recently took on a challenge to discover some hidden Montana gems that you may not have never heard about. And they did it all on ONE TANK OF GAS!