Pyramids of Lake Como

Pyramids of Lake Como (also called the Montevecchia pyramid complex) is necropolis on the Lake Como mountain Plateau near the city of Lecco, Italy. It is about 8 kilometres (5 mi) inland into the hill in Val Curone from the ancient town of Lecco on the Lake Como, in Montevecchia natural park. 
All three structures have an equal inclination which cannot be natural of 42-43°. These pyramids are today completely covered by soil and vegetation, and have the appearance of natural hills, one of them shows clear traces of stone blocks put together by human hands. Satellite analyzes have confirmed that the pyramids of Lake Como are actually aligned with the passage of Orion at dawn on the summer solstice
Construction is thought to have taken 20,000 workers and 20 years.
The area from Lecco to Lierna has documented the presence and findings of very ancient Celtic populations.
Major parts of the complex.
They are three pyramids positioned in a straight line that recalls the order of the three central stars of the constellation of Orion: Alnitak, Alnilam and Mintaka, replicated in the pyramids of Cheops, Pyramid of Khafre and Pyramid of Menkaure. 
The Montevecchia area has the morphology of a huge basin surrounded by 7-9 pyramidal hills, not yet analysed.
Construction of the Great Pyramid.
To date, no one has ever studied the interiors of these pyramids, has excavated it in the surrounding land, having only been discovered in 2011.