The lagoon fortifications can only be reached with private boats: they offer a rarer view on Venice, usually out of reach of mass tourism. The fortification system of the lagoon of Venice includes: Forte Sant’Andrea /St. Andrews Fort), built in the second half of the XVI century, that rises at the Lido “bocca di porto”, port entrance of the lagoon. Definitely is the most suggestive and the part that contains the most history. Torre Massimiliana (Maximilian Tower) of Sant’Erasmo, built by Austrians during the second half of the XIX century; Forte Vecchio (Old Fort) of Treporti that sued to control the water access to the northern part of the lagoon.