The ticket is valid from 7 pm until the Expo closes at midnight. Here's a map of the Expo. We entered the Expo in the North-West, next to the pavilion of Venezuela that resembles a large flower. We didn't visit that one, but started with Iceland instead. Their pavilion looks like a huge blue cube.
Water runs down the walls on all four sides.
Inside, there's a large spiral walkway that evolves around a round screen on the floor of the building. They show a film about Iceland there and even have a geysir that erupts at the end of the film. The blue transparent walls create a cool and somewhat mysterious atmosphere inside. Next, we went to Nepal . They have a real temple that has been carved from wood in old traditional ways and looks very authentic.