The castle of Hostalric was built on an ancient volcano that dates back around 2 million years. Specifically, it is located on remnants of volcanic lava and other materials expelled during eruptions. Forming a circle around it. Today, one can still see the remains of a lava flows from gentle eruption, as well as fragments thrown into the air during a stronger, more explosive eruption. The landscape visible from the fortress, with its mountains and valleys, is related to this volcano.
At the main bastion, or the Bastion of Sant Francesc de Pàdua, you can clearly see the interior of this volcanic view. The magma that formed these volcanic rocks had a special composition, with specific characteristics that led to the formation of basalt, the rock visible at this point. The presence of underground basalt tells us that, a long time ago, this area had active volcanoes.
These volcanic rocks, known as igneousbecause they originate from volcanic fire, form when lava reaches the surface, cools down and solidifies. Basalt is a tough and durable rock that provides a stable base, resistant to erosion and potential attacks, perfect for building defensive fortifications like the Castle of Hostalric.
The qualities of basalt have helped the castle of Hostalric withstand the passage of time and reach us today as a remarkable monumental complex.
The medieval quarter also has basaltic roots, as the houses are built upon ancient rocks and volcanic materials.
