In the Municipality of Tinaja in Lanzarote there is one of the most striking natural elements of the island, known as Natural Monument of the Cave of the Naturalists or Cueva de las Palomas. This interesting natural monument is located concretely between the municipalities of Tías and Tinajo, has an approximate area of about 2 hectares and in 1994 received the classification of Espacio Natural de Canary Islands.

The Cave of the Pigeons or Cave of the Naturalists constitutes a singular and very representative geomorphological element, the visitors that accede to it will be surprised with the galleries that run through its interior, the great beauty that its different rooms and scientific interest keep, which makes it stand out from other caves on the island.

The volcanic tube formed the pahoehoe flows of the final phases of the Timanfaya eruption in 1730 and 1736. The formation is associated with changes in the volume of lava emitted during the active period, its interior has been mapped by speleologists and has a north-east orientation and extends along a length of 1640 meters. In the layout that draws is divided into 2 branches, they have a high degree of conservation and is characterized by showing the full range of characteristic morphologies of this type of volcanic caves.

In San Bartolomé there is one of the most important mills in the whole area, it is known as Molino de José María Gil. The mill is one of the oldest in Lanzarote and is classified as Good of Cultural Interest, thanks to the good conservation of it.

The mill was built in 1870, in the first part of the 20th century, in 1919 it was acquired by José María Gil. The Mill consists of a circular tower built in mud, stone and lime, the interior is distributed on three floors. The first of the plants was dedicated to the storage of tools and grain, the second plant left ground the gofio or flour and the last of the plants that is where the grain was overturned before being ground.

In 1920 the mill was closed and replaced by a system that worked with diesel. It should be noted that the Molino de José María Gil had as a curiosity a wooden door through which the facilities were accessed whose lock was formed by wooden pieces without hardware that opened with a unique key made in the same material. El Molino is today one of the symbols of San Bartolomé and a must-see.