I say build it in a forested area. Simply remove the trees in the imediat and sorrounding area and bam you got an nice sight. it is also helpful to include a river, that is build on top of the river so you can have some more dettail from the outside and you get a few awesome interior decoration choices
Im over level 10, I was able to access the sigcard through the pop up text (aka you have reached level 10 here is sigcard) but it does not show up where it is supposed to be accessed