Union des Comores

Last year, I took a tour with Intrepid Travel to the islands of Comoros. The dozen travellers in my group were all inveterate world travellers who had accumulated well over 100 countries each. Postcards are such a great way to document your hard-to-get-to destinations.

Vietnam

 Vietnam may be a tricky country to get in and out of, but they can sure do lovely postcards and stamps. 

If you're ever visiting Vietnam and flying into Ho Chi Minh City (SGN), you would be advised to allow a full hour for immigration and customs formalities. 

Belgrade, Serbia

This Balkan state has endured its fair share of troubles over the past 100 years and more. Still, it is a fascinating city to visit. I was there in May 2015.