I tried to translate the name of one of B.E. Murillo's paintings -- Paesaggio, on Google translate site. No result.
Is it Spanish for travelling/passage? This painting is in the Prado, but I can't find any image of it. The label that I have was on the back of a painting I purchased years ago, and have just found out that it is a David Roberts painting of
El Castillo de Alcala de Guadaira, not a Murillo at all.

No. The reason you couldn't translate it from Spanish is because the word is Italian, not Spanish. It is Italian for landscape. The equivalent Spanish word is paisaje.

Is this the painting?
http://www.viejospuertos.com/n/len/0/ent/301/murillo-paisaje
I took to wondering whether "landscape" might be a description of the type of painting rather than the name of the painting, but it appears that this painting is called Paisaje.

As iviehoff said on #1, paesaggio isn't Spanish but Italian.
BTW, if it's the painting showed on the link provided by iviehoff on #2, you can find an image of it on the web of El Prado. As you can see they call the painting Paisaje con cascada.