I would like to know how I can create just the outlines of this image. Like I only want lines of the shape.

[![enter image description here](https://i.stack.imgur.com/kQhol.png)](https://i.stack.imgur.com/kQhol.png)
[Source Image](http://www.uppsalacity.se/App_Themes/Default/img/UAcity_b_skyline_768.png)

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Like this:

![enter image description here](https://i.stack.imgur.com/Gv31z.jpg)