Mezotne Hillfort is situated on the left bank of the Lielupe River opposite the Mezotne Palace. One of the largest fortifications of the 9th - 13th century Semigallians, covering an area of 3,500 m2, with a height exceeding 16 m. Over an area of 13 ha the ancient town was situated in the territory between Mezotne Hillfort and the Wine Hill – Hillfort. Next to the Hillfort – Mezote Church (not restored!) and the family cemetery of the owners of Mezotne Palace – princes von Lieven. Traditionally on the third Saturday of May Mezotne Hillfort Festivity is held here.
In Mezotne Hillfort there is installed "Bright Ants Trail" that offers various activities. Here you can find out about the unique nature inhabitants of the castle mound - the bright ant, hermit beetle, grass-snake, woodpecker, stork and the noctule.