The Temple of the Sun "Sacsayhuaman" on a hill above the city. Note the perfect Inca stonework. The biggest stone is 9 m (30 ft) high, 5 m (16 ft) wide, 4 m (13 ft) thick and weighs over 200 tons. It's still unknown, how the Inca moved such heavy stones from the quarry 20 km (12 mi) away to the temple. They knew neither wheel nor pulleys.