On this card we can see the "Water Tower, one of the most emblematic buildings of Expo 2008 and its vertical icon. It was designed by Enrique de Teresa. It is 76 metres high with 10,400 accessible square metres. At the upper floor, there is a 720 square metres panoramic bar with fantastic views over Zaragoza. Inside the tower there is a 23-metre-high sculpture called Splash, which represents a Splash of water, "the arrival of life on our planet".The Splash sculpture based on dynamic simulation systems was designed by Pere Gifre from Ikonic Arts.
The Water Tower hosts the exposition Water for life where "audiovisual media and lighting pay a key role in the way the contents are communicated". - in: wikipedia
This is the Aquarium. "This thematic pavilion is the biggest freshwater aquarium in Europe with 300 species of fauna from different rivers around the world in 60 tanks or terrariums. Rivers represented are:
The Nile: It contains species of the great African lakes. It also has crocodiles and an exhibition on the Mediterranean and the Red Sea.
The Mekong: In this river visitors will find species of the Himalayas, gardens from the river's lower course, the Pacific Ocean and coral reefs.
The Amazon river: It is divided into three different areas. The first of them is the Amazon jungle with its coconut trees and mangroves. The second area is about the Amazon forest while the third area is the mangrove swamp with an exhibition on the Atlantic Ocean.
The Murray-Darling river: This exhibition begins in the flooded regions and goes through desert areas. It finishes with a video exhibition about birds.
The Ebro: It is also represented in two areas. The first area is a mountain cave and the second is the course of the river. There will also be an exhibition on the Mediterranean sea.
The "World River": It represents the past, when "all the continents were united as a single island surrounded by ocean". - in: wikipédia
More than one hundred countries, plus dozens of companies and NGOs, participate in Expo 2008. These are some of the cards Paulo got on the Switzerland pavilion and from the spanish region of Andalucía pavilion.
And even more cards, these ones from Russia and Croatia pavilions and some others.
If you want to some more informations about Expo 2008, this is the official site: http://www.expozaragoza2008.es/