
Vao Tower Castle, built in the second half of the 14th century from local limestone, stands as a well-preserved medieval fortress in northeastern Estonia's Väike-Maarja Parish. Originally constructed as a vassal castle to guard trade routes and defend against uprisings, the structure features authentic medieval elements including intricate stonework, a hidden interior staircase, and period furnishings. Restored in 1986 and opened as a museum in 1991, the castle now welcomes visitors with exhibitions spanning two floors—the first showcasing the history of the castle and surrounding villages, while the second recreates a medieval living space with hand-washing basins and latrines. The tower fortress remains one of the finest examples of 14th-century military architecture in Estonia.