In the heart of the town of Pietrasanta, a few steps away from the Duomo, stands the Palazzo Panichi-Carli which was constructed by Tommaso Panichi during the 15th century. Acquired by the Carli family, the building underwent over the time different transformations still visible through the coexistence of original brick elements and more recent stone structures, particularly characteristic of the loggia.

Recently obtained by the commune of Pietrasanta, the palazzo hosts since 2009 the Museo Padre Eugenio Barsanti, a small expositive space completely dedicated to the works of the Piarist father, inventor of the first prototype of the internal combustion engine. Inside the main room, in addition to two engines made during the second half of the 19th century, there are some explanatory panels that portray Barsanti's life, the sites that are related to him and the history of his inventions.