monolith
noun
[ ˈmɒn(ə)lɪθ ]
• a large single upright block of stone, especially one shaped into or serving as a pillar or monument.
• "we passed Stonehenge, the strange stone monoliths silhouetted against the horizon"
• a large, impersonal political, corporate, or social structure regarded as indivisible and slow to change.
• "independent voices have been crowded out by the media monoliths"
Origin:
mid 19th century: from French monolithe, from Greek monolithos, from monos ‘single’ + lithos ‘stone’.