The American Library of Congress (thus public domain) published a dry book back in 1995 called "Germany : a country study" full of old useless statistics and history and etc. One of the good things about that though were some great Germany symbolic clipart images. This is a depiction of the Cologne Cathedral.
科隆大教堂
cathedral、church、Cologne、game asset call、German、Germany、Koln、location、religious、tourism、tourist
大教堂、教會、科隆、遊戲資產調用、德語、德國、科隆、地點、宗教、旅遊、遊客
資料來源：openclipart ( https://openclipart.org/ )