Translation of pertain in Spanish

We were a little worried about the entry to Vietnam because regulations specifically mentioned to leave two blank pages in the passport for the Visa stamp and my wife's passport was full.
We stayed in this place for quite a while as it was the most spectacular place we have visited so far. It was unbelievable how much thought was put into construction of these magnificent sites.
I guess it is a very interesting book, but I did not entirely understand it. What did the author try to say, what message did he want to deliver? Do you want that I recommend another book?