How about gifting your husband a unique experience (like a tour or ticket) to an archaeological site or dig? You could plan a trip together to visit places like Machu Picchu, Egypt's pyramids, or Pompeii. Depending on your budget, you could also consider hiring a private tour guide or archaeologist to lead your expedition and give you both an insider's perspective. You could also consider gifting him a piece of historical art, artifact, or a book about archaeological expeditions.
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.