My AP teacher utilized this website before as there are multiple-choice quizzes to test students for enrichment. Maybe, in the future, this can be utilized on some of the unit tests and other assessments.
This is the website for the Metropolitan Museum, the largest art museum in the U.S., if not the world. It is located in New York, but online you can find whatever art pieces available.
This is a website full of blank maps. If you guys want to do a labeling quiz or a coloring worksheets, students might learn a lot from these geography stuff.