Aris is an open source platform for creating and playing mobile games, developing tours and telling interactive stories. " Using GPS and QR Codes, ARIS players experience
a hybrid world of virtual interactive characters, items, and media placed in physical space."
This site allows you to create trading cards for any purpose. you could create cards filled with historical facts about a person (fictional or real). You could fill the card with information about a landmark or location. you could even use this site to create cards for a game. To sum it up, this website could be used to study or play a nice card game that you just created.