How about finding a local cultural history museum and purchasing a membership or tickets to one of their lectures/events? You could also consider getting them a book on a specific cultural history topic they are interested in or finding a personalized guided tour of a historical site related to their interests. Another idea could be to look into a painting or print related to a particular historical figure, event, or period they are fascinated by.
Or you can get her/him a star map with the date of the wedding.
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.