Largest stone moved by manpower alone

The largest stone ever moved by manpower alone, i.e. without the use of animals or machines, is the Thunder Stone, an enormous boulder of granite serving as the pedestal of the famous Bronze Horseman statue of Peter the Great at St Petersburg, Russia. Before being cut into shape as the pedestal, the Thunder Stone measured 7 m by 14 m by 9 m, and was estimated to weigh around 1500 tonnes. It was moved 6 km overland to the Gulf of Finland from the marsh in Lakhta, north of the Gulf by dragging it across the frozen Russian countryside during the winter of 1768, a process taking 9 months and requiring 400 men, pulling it upon a metallic sledge.