How about buying him a farm animal adoption package? You can search for local animal rescues or sanctuaries and sponsor an animal on his behalf for a year. Alternately, you could consider gifting him a day trip to a local farm where he can learn more about animal husbandry, participate in farm activities, and gain hands-on experience. You could also get him a book or subscription to a magazine about animal husbandry, or even plan a visit to a zoo or animal sanctuary.
Or you can get him a star map with the date of your anniversary.
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.