The Rajnagar Palace was built by the Maharajas of Darbhanga, who held significant influence in the region. Construction started in the early 20th century but was never fully completed. The palace was intended to be a grand residence and administrative center, showcasing the power and wealth of the Darbhanga Raj. However, due to various factors, including financial constraints and political changes, the palace was abandoned. Over time, it fell into disrepair, with parts of the structure collapsing and being overtaken by vegetation. Despite its ruined state, the palace remains an important historical landmark, offering insights into the architectural styles and social structures of the era. It serves as a poignant reminder of a bygone era of princely states and their legacy.