TIL the Mausoleum of Theodoric in Ravenna, Italy, was built in 520 AD with stones sourced from a quarry in Istria, approximately 400 kilometres (249 mi) away by land journey. The mausoleum’s roof consists of a single Istrian carved stone 10 metres (33 ft) in diameter weighing 230 tonnes

Read more: https://en.wikipedia.org/wiki/Mausoleum_of_Theodoric

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