I have filled all of my art slots but still have several dig sites available. When one of them was completed I wasn't given the option to create an artifact because there were no available slots, thus forcing me to create a free landmark for my rival.
I have two buildings that lack the theming bonus. I'd like to make room for new artifacts in the hopes that I'd get lucky and find a match. Is it possible to give away or destroy artifacts or turn them into units?
Note: I know that I can trade them, but that doesn't make room for more. I am founding a new city as it looks like my Tourism rate isn't high enough to overcome Russia's culture rate from conquering their continent. However, I don't want to found too many new cities and slow my social policy rate. I have built all buildings that provide art slots in my current four cities.