Centra Flags Map:
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You can Unlock it by either finishing the game, or you can collect 25 Borgia Flags.

Antigo Flags Map:
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You can Unlock it by either finishing the game, or you can collect 25 Borgia Flags.

Campagna Flags Map:
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You can Unlock it by either finishing the game, or you can collect 25 Borgia Flags.

Vaticano Flags Map:
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You can Unlock it by either finishing the game, or you can collect 25 Borgia Flags.

Feathers Map:
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You can Unlock it by either finishing the game, or you can collect 25 Borgia Flags.

Once you have unlocked all these maps, purchase them from Art Merchant.