ZOO DE CASTELLAR - CASTELLAR DE LA FRONTERA - ESPAGNE - (www.infoparks.com)
I had success buying a ticket online from the RENFE website. I set up a user account first, and I used PayPal to pay for the ticket. There were a few scary moments when the screen went blank afterwards but everything was emailed to me and I was able to print out the ticket and also get it on my mobile device. Be sure to download their app first. Here is a tutorial on how to set up a user account, see using RENFE | How to use www.renfe.com
Aeroport de Barcelona-El Prat (BCN) (Aeroport de Barcelona-El Prat)
Portugal is a country located in Southwestern Europe, on the Iberian Peninsula. It is the westernmost country of mainland Europe, and is bordered by the Atlantic Ocean to the west and south and by Spain to the north and east. Capital: Lisbon; Dialing code: 351; National anthem: A Portuguesa; Population: 10,637,000 (2011); Currency: Euro; GDP: 237.5 billion USD (2011).