I have been working on a map of the Red Mountain Open Space in Larimer County (see below). It connects to an open space in Wyoming called the Big Hole Open Space. Though hill shading is a very effective tool to illustrate underling terrain, until we moved the map into 3D space, I completely missed the dramatic geologic "hole" that the area encompasses!
(Click on image for high res version)
(Click on image for high res version)