Hey @BreeZeShutteR and welcome to the community!
The vector-graphic of the cologne cathedral is a licensed one, so I’m not allowed to share this, sry. You could buy it e.g. here or use some of the free ones you might find with the search engine of your choice. 
The background silhouette graphics might not fit that well anymore due to changes in code (which follows a more general approch now) - but it should work okay with these:
See @Sunny’s answer for this (or have a look in this tutorial, where it’s also described)