Help with architecture/engineering related topic

Hi everyone, I'm in y12 and I have to pick a topic/title for my EPQ soon after half term, but I have no idea what to do it on, other than that I want it to be architecture/engineering based, I take Maths, FM and Physics. Originally I planned on doing an artefact but was told by all the teachers that this would be really time-consuming and I might not get a lot of support from my school (since I would need to use stuff in DT), what are some good areas in architecture/design/engineering I could do my EPQ on? Thank you so much in advance x