The street atlas of Lisbon in the apartment lists 50 streets named after professors, from Rua Professor Abel Salazar to Rua Professor Vitor Fontes.
Because some of the names are duplicated, there are only 42 or 43 professors who are actually commemorated in this way. (I put 42 in the title because I guess that Professor Fernando Fonseca is probably the same person as Professor Fernando de Fonseca.)
Nonetheless, it seems like a very large number. Can you think of any other city which commemorates so many professors in this way?
You might expect them to cluster round the University, but in fact the Universidade de Lisboa has just two streets in this category, Av. Professor Gama Pinto and Av. Professor Anibal de Bettencourt.
This suggests a society in which a professor is respected, and more generally in which learning is valued. I hear hollow laughter from my Portuguese colleagues, but I think this must at least have been so once in order for this riot of naming streets after professors to have occurred.