The Alphabet Quest and X.

As they say X marks the spot but there is no country starting with X and only two that contain the letter X, so in the interests of the Alphabet Quest it is time to visit one of those two countries. Yes Luxembourg, in the middle of Europe, this will colour in a very small but important bit of the map. Oh and on the way to get there I'll stop in Singapore, change planes in Helsinki, do some work in Gothenburg and Stockholm in Sweden, and then fly to Luxembourg via Copenhagen in Denmark and finally home via Hong Kong. I wonder if there'll be treasure in the land of X, or perhaps the treasure is the riches of the old and beautiful city. Only two more letters to go after this.