How about gifting him a scratch-off world map so he can keep track of all the cultural landmarks he has visited? Another thoughtful gift could be a travel journal or photo album where he can document all of his experiences and memories from his travels. Depending on his budget and where he likes to go, you could also consider giving him a guidebook or tickets to visit one of his favorite cultural landmarks.
Or you can get him a star map with an important date you share.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.