A Culă is a type of building originally made to be able to fortify the ruling class against invasions during which wars?
Culă:  They were originally built as homes for the ruling Boyar class to defend against incursions by Ottoman troops during the Ottoman–Habsburg wars or against violent raids by rebels from the south of the Danube during the eighteenth century (e.g. Osman Pazvantoğlu). Ottoman–Habsburg wars: The Ottoman–Habsburg wars were fought from the 16th through the 18th centuries between the Ottoman Empire and the Habsburg (later Austrian) Empire, which was at times supported by the Holy Roman Empire, Kingdom of Hungary and Habsburg Spain.
Ottoman–Habsburg wars