Harbor disappears when city captured?

[rschissler]

In my game, I see a AI city on a separate continent with a luxury I don't have. It also has a harbor, so I figure I can capture it and use the harbor to take advantage of the luxury. I take the city but the harbor disappears. Why? I've captured cities before with harbors and they stayed.

 

[Catt]

In my game, I see a AI city on a separate continent with a luxury I don't have. It also has a harbor, so I figure I can capture it and use the harbor to take advantage of the luxury. I take the city but the harbor disappears. Why? I've captured cities before with harbors and they stayed.

All buildings that produce culture are destroyed on capture except for Great Wonders (and they don't produce culture for the conquerer). Aqueducts and hospitals are never destroyed. All other city improvements such as barracks, harbors, markets, courthouses, etc. have a random chance of either remaining or being destroyed in the capture process. In other words, sometimes a harbor will remain and sometimes it won't.