This is for more advanced students. These things are from Voice of America Learning English and The Smithsonian. The words in these stories will not be very difficult. These are basic but not easy things to read.
You can find some history, American culture, and literature here.
The Times in Plain English is a free online newspaper that features stories based on articles from the New York Times and other top American newspapers. 'Plain' here means 'easy to understand', and the stories are freshly written to reflect the original article as opposed to being an edited version. You can find articles in categories such as Health and Education, Money and Work, Immigration, and Law. The archives go back to February 2011, so there's a wealth of reading material here. A couple of additional features that should be of interest to learners are Translate This Page, and Hear This Page, where you click on highlighted text to hear it read aloud (text-to-speech not real voices, obviously).
A very useful site for learners who find it difficult to read 'real' newspapers and would like something a bit more accessible. The About Us page on the site says that the content "may be reproduced and distributed by all", which is good news for teachers worried about copyright issues (some are!).