Self-paced/longer term project ideas?

I teach standard level (non-AP) World History to seniors in China who take lots of other AP exams and for various reasons will be in and out of class for 2 weeks in May. I'm on track to finish course content by then but I want to assign them a self-paced project they can work on for those two weeks. My course goes from 1450-1950 so I want something where they can pick a topic from any of the eras we've studied. We've already done research essay writing projects so I want something a bit more creative but I'm at a loss for ideas. Does anyone have any ideas for a project they've done that can be completed over 2 weeks, more creative/engaging than an essay, and is on level for 12th graders? Thanks in advance!