Roughly in chronological order, they are as follows:
- The Euphrates Tunnel (circa. 2180 to 2160 BC, a little less than 1 km long). ...
- The Etruscan tunnel at the Furlo pass (circa. 450 BC, length unknown, but probably less than 40 metres). ...
- Grotta di Cocceio (aka the Cocceius Tunnel, circa. ...
- Cripta Neapolitana (circa.
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