I like the color scheme of this one. It looks clean and slick and having the pop of color on the images makes them stand out. I could do this for my poster by having only the wonders in color and everything else in a monotone color palette.
I like how this one is in a list layout. Instead of showing each wonder on the map, I could have them in a list, like this one. It could be in order from the least visited to the most visited, or age of the wonder.