Vao is a village in Väike-Maarja Parish, Lääne-Viru County, in northeastern Estonia.
Vao Castle 
Vao castle, with the protruding latrine visible on the left side of the building.
Vao (German: Wack) castle is a well-preserved medieval tower fortress. It was built in the later half of the 14th century as a so-called "vassal castle", i.e. a smaller fortress built to keep control in areas where large strongholds were not needed. Other notable examples of such castles in Estonia are Purtse and Kiiu castles.
In 1442, the castle belonged to the family Wack. Subsequently it has belonged to various aristocratic families. In the 1770's the tower was certainly no longer used a manor, since at this time a new baroque manor house was built in the vicinity. In 1986, the castle was renovated. During the renovation new painted glass windows made by Estonian artists Tuuli Puhvel and Anne Ehasalu were also added. There is no indication that the tower was ever involved in any military action.
The castle was not designed for any major military operations, which can be deduced from the thickness of the walls. It was built of local limestone, to a height of four storeys. The cellar was used for storage, the ground floor was used as an office for the feudal lord, the second floor was the lord's living quarters and the top floor had a purely defensive function. The living quarters were well-equipped with a latrine, a chapel, a bed alcove and a fireplace.
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Coordinates: 59°06′05″N 26°11′37″E / 59.10139°N 26.19361°E