If you decide to travel to Sao Tome and Principe: There is no U.S. diplomatic presence in São Tomé and Príncipe. Contact the U.S. Embassy in Libreville, Gabon if you need consular assistance. Holde. And finally, be sure your passport is machine-readable; look for a series of numbers and/or letters and some unintelligible squiggles beneath your bio data. When do I need a passport? You’re leaving. Croatia is Hrvatska, Hungary…