Portal:Bulgaria/Did you know/3

...that 62% of the surface of the Pirin Mountains (peak pictured) is granite, and is therefore covered with mainly ancient metamorphic rock?
...that the Crusade of Varna required simultaneous attacks on the Muslim Ottoman Empire by Christian Hungary and the Muslim Karamanids, which did not occur?
...that the area on which Vrana Palace was constructed, just outside of Sofia, was initially purchased by Tsar Ferdinand I in 1898?
...that mining has caused significant ecologically damage to the Timok River recently, and also from heavy metal industry in other cities?

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