Make a photo album or a scrapbook: take the time to sort through some of your favourite photos (from your year at University, from a semester abroad, or from a trip or vacation you took) and stick them in a photo album, writing the place and date next to them.
Another option is to stick them into a scrapbook album, note down some of your favourite experiences along the sides, add concert/movie/museum tickets from places you visited, decorate with colourful or patterned paper, dried flowers, or any other 3D decorations! If there is someone close to you, with whom you who shared the experience (friend, family, partner, etc.) consider gifting them the album!