A Gift for the Friend Who Moved Away, From the One Who Stayed
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Someone you like is moving across the country, and there is a dinner about it, and you are supposed to bring something.
The instinct is to give them something about here. A photo of the group. A print of this city. Something that says do not forget us, which is sweet and also slightly heavy, because you are handing a person a small object whose entire message is that they are leaving.
The better gift points forward
Turn it around. Give them the place they are going to.
It says something different and considerably more generous: I paid attention to where you are going, I am not treating this as a loss, and I expect it to become somewhere you belong. That is a much better thing to hand someone the week before a move, when they are equal parts excited and quietly terrified.
It also gets them past a specific problem. Everything they own is from the old life. Walking into an empty apartment in a city where you know two people is a strange feeling, and having exactly one object that is about the new place, given by someone from the old one, is a small bridge between the two.

Why this works for Denver in particular
Denver is a destination city rather than an origin one. An enormous share of the people living there arrived from somewhere else, usually on purpose, usually chasing a specific idea of how they wanted to live.
That makes a map of the place a slightly different gift than a map of a hometown. It is not nostalgia. It is a marker of a decision somebody made, given to them at the moment they made it.
There is a practical bonus. When you visit, and you will, it is on the shelf and you both end up leaning over it working out where their apartment is relative to everything else. Maps do that to people.
The piece
Our Denver 3D city map is a compact framed model of the central district, built from urban layout data, with raised building heights, street patterns and park spaces. It is about seven and a quarter by five and a third inches, in a black frame, ready to display on a desk, shelf, or wall. The design is licensed from jarvizar.
Being clear: it is a decorative model of downtown, not a navigational map, and it covers the central district rather than the whole metro area. If they are moving to a specific outlying neighborhood they already care about, this is the wrong gift and their hometown map is probably the right one.
One tip if you are giving it at a leaving party: say what it is out loud when they open it. The point of this gift is the thought behind the direction it faces, and that thought is invisible if nobody explains it.
Going the other way and giving them the city they are leaving? That is a legitimate choice too, and picking the era rather than the address covers when it is the better one.