Castillo San Sebastián de la Cruz, Spanish colonial fort in Corral, Chile

Castillo San Sebastián de la Cruz is a colonial fortification in Corral, Los Ríos Region, Chile. It was built from 1645 on plans by Constantino Vasconcelos and rebuilt in 1764 by Irish engineer Juan Garland in cancagua stone and brick masonry. It comprises three sectors: the castle itself (1765), the Batería de la Argolla (1764) and the Batería de la Cortina (1767), with walls, gun batteries, a moat and garrison quarters.

Spanish engineers built this military complex between 1645 and 1678 to protect the southern Chilean coast from foreign invasions and indigenous attacks. The project emerged from the region's strategic importance for controlling Pacific access.

Each summer, reenactors in period uniforms stage the 1820 Toma de Valdivia here, firing cannons and muskets. It is the only fortification in Chile where a battle between Spanish and Chilean soldiers is regularly reenacted in colonial-era dress, as part of the site's heritage education programme.

The fort is reached through the town of Corral, located approximately 15 kilometers from Valdivia, which offers good accessibility. Guided tours are available throughout the year and help visitors understand the defensive layout and how the structure functioned.

A tunnel runs through the base of the fort, created in 1930 for railroad passage, showing how historical sites integrate new functions. This underground passage remains visible today and reveals layers of different periods at the location.