Here is a quick and dirty example I whipped up of a hill in a city (click here). This was pretty easy to make using shadows, blurs and bevels – but it’s pretty basic.

The real difficulty is if you want to have multiple levels with buildings, like maybe a city that winds down the side of a cliff around a waterfall. There is nothing native in CC3 to handle that (that I know of). You would need to do a lot of customization like reducing symbol sizes at lower levels, fading colors, etc. in order to get the effect you want. CC3 has Sheets (similar to layers in Photoshop) that would make the project doable, but it’s definitely not something you could whip up in just an hour or two.