Thank's to Stazi's groundbreaking discovery:

Before the start of the campaign each province gets the unique and indestructible landmark building (multiple copies of "forest clearing" from VI). I've discovered that a building to be indestructible only need to use "forest clearing.bif" as its icon file name (3rd column in BUILD_PROD file). So, all landmarks share the same icon and description but Info Pic can be different. If you nullify the description's text and imprint the whole description directly on the info pic you can have unlimited number of different indestructible buildings. To know what is the role of anyone of these buildings, you only need to right click on it.
we have another tool to use in the game.


This thread is to find uses for this features and propose new building ideas which could have them - remember such structures can be present from the beginning and will never be removed so new structures can be unique to a specific province.