Note: What you find below are legitimate, non-copyright violation sites.
One more note: Text that you will see via the below links (particularly the art museums and some of the music sites) will be in various languages. Most browsers, in their Settings, have a language section that allows you the option to have different languages translated into your language along with an option to Offer to Translate (Chrome, the setup should be similar in other browsers). As far as a mobile device goes, I use the Google Translate app. Not because it is necessarily better than other translators (machine translators are in a very crude stage of development). The trick is to translate Google (foreign language) into Google (insert your language here), and then into (insert your language here). Other translators may be better or worse. In any event, looking at annotated great works of art from the Prado (hundreds at least), on a mobile phone is, in my opinion... well, it's just my opinion.
Note also that many of the primers about the sports use metric system measurements. Here is a simple metric converter that you might want to set up in a separate tab. A time converter for Music performance times may also be useful.
Stay safe and enjoy.
