Chinese pyramids are ancient mausoleums and burial mounds built to house the remains of several early emperors of China and their imperial relatives. About 38 of them are located around 25 kilometres north-west of Xi'an, on the Qin Chuan Plains in Shaanxi Province. The most famous is the Mausoleum of the First Qin Emperor, northeast of Xi'an and 1.7 km west of where the Terracotta Warriors were found. Chinese pyramids were also built during the Han, Tang, Song, and Western Xia dynasties.
Ħaġar Qim (Standing/Worshipping Stones) is a megalithic temple complex found on the Mediterranean island of Malta, dating from the Ġgantija phase (3600-3200 BC). The Megalithic Temples of Malta are among the most ancient religious sites on Earth, described by the World Heritage Sites committee as “unique architectural masterpieces.”
The Longyou Caves were only discovered late in the 20th century. At least 24 caves have been discovered so far. All of which were carved by hand. Although the overall excavation involved almost a million cubic metres of stone, there is no historical record of them or evidence of the work. Their origin is a complete mystery. At present there is no explanation for their existence. They represent one of the largest underground excavations of ancient times.: