The old aquarium of Trocadero, in front of the Palais of Chaillot. Today, everything has been rebuilt and the aquarium is brand new.

Probably the old heating system of the old Trocadero Aquarium.

Quarries of Saint-Cloud, in the Trocadero Park

The underground quarries of Saint-Cloud (of coarse limestone) are used as building stone. The grand facade of the Colonnade of the Louvre is partly made with this stone. The rest comes from the underground quarry of Saint-Leu Esserent. It also used the stone to build the castle of Saint-Cloud, located a few tens of meters from the quarry.

The walls of building quarry were partially dismantled to get new stones. They were used to renovate the castle of Saint-Cloud in the 19th century. However, the consequences of a large fire, the foundations were razed. The stones stolen are become useless.

Inside the old aquarium of the Trocadéro. There is a new one now.

Under the Trocadero Gardens, the park of Saint-Cloud, a few long corridors developed a total of about 300m.