Greetings to the wonderful community!
I have started a round-the-world flight with the marvellous IF A320 (Aegean Airlines colours), with the intention to land only at capital cities, while covering the shortest possible distance, starting from Athens, Greece travelling eastwards.
This is a variation of the “travelling salesman” problem, and I was able to determine a route with the help of https://www.jetpunk.com/user-quizzes/234916/shortest-route-through-all-world-capitals
Then, I used http://www.flugzeuginfo.net/table_airportcodes_country-location_en.php to find the ICAO code for every airport. This site conveniently presents all the codes on the same page, (you don’t have to fill a form and wait for the result) and you can easily find them with a simple page search.
Then, I used Great Circle Mapper (https://www.greatcirclemapper.net) to generate the route (I registered a premium account there, it’s an excellent site).
The main idea is whenever I land, to read something about the country or the city in Wikipedia (e.g. the history of Middle East when at or around OSDI), or pay homage to a prominent figure (e.g. Nelson Mandela in FAWB), or watch a travel video on YouTube of whatever country I am at.
I entered the airport codes and here is the map of the first 50 legs of the journey.
And here is a screenshot from the first leg (LGAV-HECA) while flying over Santorini island.
Turning for HECA with the Suez Canal in the background