The first revolt in Western Macedonia against Ottoman dominion and the Bulgarian Exarchate broke out in 1878 in a ravine near the village of Hromio (which is 37 km from Kozani and 12 km from Aiani). In 1989, the Literature and Arts Association of Kozani Prefecture resolved to honour that first revolt and the Macedonian freedom fighters by setting up an open-air museum on the exact spot where the revolt broke out, with the aim of illustrating the enduring history of the Macedonian Greeks from antiquity until 1912.
Visitors may stroll around the area admiring the busts of twenty-one Macedonian freedom fighters, the museum of the fallen heroes, a monument with the busts of Philip II, Aristotle, and Alexander the Great, bridges, springs, and the restored Church of Agios Nikolaos, whose priest blessed the weapons of the Greek fighters in 1878. Inside the Museum of the Macedonian Struggle there are also photographs, engravings, and mementoes of those who fought to make Macedonia free.
Text cited from the Macedonian Heritage website (October 2012)