I have had the good fortune of spending time in some of the world's most interesting cities. The city I most want to visit that I have not been to is Prague in the Czech Republic.
Prague is one of the few great European cities that was not bombed during the second world war. The buildings in central Prague are pretty much as they have been for at least a century or more. Many of the streets are still covered with cobblestone.
I just ran across this video of Prague, shot from a small camera drone. It showcases the beauty of this great city. A visit to Prague is very near the top of my personal bucket list.
Here is a link to the aerial majesty of Prague... https://www.youtube.com/watch?v=xfo2gvt2OlI