[Self-Access Reading] How to utilize '7 Mysteries of the world' section?

I collected 7 articles. 6 texts come from 7 ancient wonders of the world. The 7th one is about Moai. There is a writing activity in the textbook about Moai. So I found the passage about that.
This part can be used as a treasure hunt activity. So teacher prepares some questions that can be answered by reading the texts. This material comes with the treasure hunt activity as well.
But two of the articles are difficult to read. Those difficult articles are for those who want challenge and have higher proficiency level.