The estate in Milzkalne that is along the banks of the Slocene River dates back to the 15th century, when it was built as a closed complex for the Livonian Order.  It is the only fortified estate of its type to have survived to the present day, and it was once used as a hiding place for aristocrats during an attack.  The gate towers with their ornate weather vanes were built in the late 17th century, and the ancillary buildings date back to the 18th and 19th century.  A brick wall with firing apertures survives.  The Latvian Road Museum is in one of the wings of the complex, while the former mansion offers accommodations, tours and tastings of local goodies.