This is one of the European open borders: the Free Territory of Trieste – Italy State border.
The Free Territory of Trieste is an independent State since 1947. Since 1954, the administration of the Free Territory of Trieste is entrusted to the Italian Government by the Governments of the United States and of the United Kingdom, on behalf of the UN Security Council.
For further information, you may visit our website: https://triestelibera.one