In 2014, the New York Metropolitan Museum of Art released over 400,000 works of art as free high-resolution images available on the web. Want to expand your artistic tastes and knowledge? Check out the collection right now, which you can filter by artist, material, geographic location, era, department, and more.
Here is a site dedicated to bringing you all kinds of free sounds for your use.
Here is an interesting website devoted to all things in the future. Enjoy!