Aduana de Los Queñes, Historical customs building in Romeral, Chile.

Aduana de Los Queñes is a stone complex in Romeral consisting of two equal structures with four circular towers topped by pointed roofs positioned at each corner facing cardinal directions. The towers are evenly distributed around the compound to create a symmetrical defensive design.

Built in stone masonry around 1860 at the confluence of the Teno and Claro rivers, the customs house was received by Manuel García, engineer of the former Province of Colchagua, in 1864. Its main purpose was to control the livestock traffic between Chile and Argentina on the border road toward San Rafael. The customs office ceased operating around 1960, and the building was declared a Historical Monument in 1998.

The customs house controlled livestock driven between Chile and Argentina through the Teno and Claro river confluence. Its stone masonry and oak timber follow mountain building practice, and the four corner turrets with their spires give it the look of a small medieval castle. The building has been a National Historic Monument since 1998.

The building stands at the confluence of the Teno and Claro rivers, on the border road toward San Rafael in Argentina, about 10 meters above road level. Access is by road through the mountainous sector of Romeral commune; check weather and road conditions before setting out, and bring warm layers for the mountain climate.

The building was constructed with towers at all four corners, resembling a medieval fortress more than a typical customs post. This defensive design makes it an unusual example among South American border facilities.