One of the things I like to do for fun is to go on walking tours of cities around the world. Sometimes I revisit places I have been to in the past. In recent days, I have been to London, Pisa, Venice, Cologne, Madrid, and Nice.
How can I do this?
Often I walk around cities that I would like to visit in the future! For instance, I recently saw Buenos Aires, Argentina.
How is this possible? Especially, in the age of Covid-19?