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| In the 1700's cattle were grazing on the Harakka Island. |
| In 1855 during the Crimean War a few houses were built. |
| 1928 a military research institute was built on the island. |
| 1988 the main building was passed to the Culture Centre of the City of Helsinki, which rents out space as workshops to artists of various fields. |
| The nature on the island is well preserved due to its having been a closed military area. Several rare species of plant occur on the Harakka Island. |
| The island is located 400 metres from the mainland. |
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