Mola Fortress built

1848 CE.

Shown on the map at 39.874°, 4.313°.

The Isabela II Fortress or La Mola Fortress is a Spanish military complex located on the Mola peninsula, at the entrance to the port of Mahón, on the island of Menorca, opposite the castillo de San Felipe, which protects the entrance to the port from the other side of the mouth. Next to this fortress is the easternmost point of Spain. Its name comes from Queen Isabella II, who ordered it to be built in the mid-19th century.

Text from the Wikipedia article Mola Fortress, licensed CC BY-SA 4.0.

Everything else in 1848 CE

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