Aduana El Manzano, Historical customs checkpoint in San José de Maipo, Chile.

Aduana El Manzano is a former customs house on Route G25 toward El Volcán, in San José de Maipo. Its surviving wing, built of adobe, was part of an L-shaped plan whose perpendicular arm, damaged in the 1958 Las Melosas earthquake, was demolished in 1983. The remaining section holds a central core of wooden rooms with adobillo, flanked by two wooden galleries with continuous windows on the north and south sides.

Originally a manor house of the El Manzano estate, the building became a customs control point from 1870 known as Aduana Portillo del Maipo. It served this function until 1973, marking over a century of border operations at this mountain location.

The building shows how Chile managed border control across mountain routes, connecting passages to the Piuquenes and Cruz de Piedra passes. Visitors can see why such checkpoints mattered for linking different regions.

The site is easily accessible from Route G25 while traveling toward the El Volcán valley area. It makes for a convenient stop on mountain excursions where visitors can explore the building complex at their own pace.

The original building had an L-shaped plan; its adobe wing, which held the main living room and dining room, was badly damaged in the 1958 Las Melosas earthquake and demolished in 1983. The surviving wing kept the bedrooms, so the present outline is only part of the former house.