I found this postcard in several shops in Lisbon, Portugal. It depicts the transatlantic voyage from Lisbon to several locations in North and South America.
I wonder at what time this kind of advertisement was popular.
Some indications: I found this blog: http://20agetravel.blogspot.pt/2012/03/portugal-shortest-way-between-america.html that indicates that the postcard itself may be from 1907, however it does not give explanations why this may be so. Then the city associated to Pena Castle is called Cintra, a name not commonly in use anymore (now it is called Sintra). According to Wikipedia (http://en.wikipedia.org/wiki/Sintra#History) the name was used in 1809 but I could not find information in which period the city's name became Sintra.
Full resolution here: http://flickr.com/gp/tk-link/7T2130