Over the years, I have been able to visit quite a few countries around the world. In many countries, I arrived by bicycle, train or bus and left as well. For example, Mongolia, we entered from Russia by train and left through the south-end towards China. Some borders, however, are more difficult to cross. Kyrgyzstan, we entered by bicycle across Kyzyl mountain pass into "Noman's Land", which stretches a good 10km.
I painted the world in red for those countries that I visited for at least 1 day.