Boston has a great public underground train system. London does too. Chicago has its wonderful “L” train network (with a horrible website). San Francisco has the BART.
Denver has two light rail lines. They would love to expand to a third line. The current economy will not allow such expansion. Solution? Go back 50 years. At that point in time, they could have done it. But then Denver was a sleepy western town with no thought of miles of tract homes.
Takeaway? Plan for the future. (Note to self.)

So, I’m in this conference center. Well, at least the second floor was a conference center. Anyhow, one wall along the entrance consisted of several backlit photographs of famous site around the city of Boston.