What is Extensive Reading? It’s the kind of reading you do where you choose the things you read, not your teacher, and you decide how quickly to move on.
Here are a collection of sites for Extensive Reading:
Dreamreader.net/ is site with reading material made by English teachers.
Damn Interesting is a site that has a lot of interesting historical topics, many not commonly known. It is not written by English teachers but the quality of writing is fantastic. It may be difficult at times, but you can always use your dictionary later.