Structures of historical, archaeological and paleontological interest – found in a very unusual or seemingly impossible context – that defy conventional historical chronology are part of some of humanity’s great mysteries.

Impressive works such as the pyramids of Egypt or the curious order of stones at Stonehenge are some examples of these structures, which intrigue the most experienced scientists and delight mystical enthusiasts.

Giant blocks were stacked in what way millions of years ago? And what was the purpose? How can we also explain rocky origins in structures that were quite different from the place where they were built? How would the transport have been?

All of these are questions that are still unanswered and are likely to remain in our imagination (and that of scientists) for a long time to come. Check below six of these ancient structures that science cannot explain.

6 – Tiwanaku and Puma Punku

Tiwanaku is an important pre-Columbian archaeological site located in Bolivia, and Puma Pumku is a complex of temples and monuments that is part of that place. The structures are examples of engineering so monumental that they surpass even the work of the Aztecs.

The stone blocks at the site weigh many tons and bear no chisel marks, the mystery remaining as to how they were shaped or moved. Some stones are sandstone originating from a place 10 kilometers away from there, and one of andesite originates 50 kilometers.

This all raises the question of how huge blocks (up to 400 tons) were transported in a time before the domesticated horse in South America. In Puma Punku the stones of volcanic origin were finely cut, but the process carried out in creating the structures is still it is not fully understood by scholars.

5 – Nazca Lines

The Nazca Lines are a set of ancient geoglyphs that are located in the Nazca desert, in southern Peru. Scholars believe that the Nazca Lines were created by local civilization between 400 and 650 A.D. They print hundreds of drawings of animals or stylized human figures, but with an impressive line.

The largest are more than 200 meters in diameter. There are those who believe that the drawings were not made by humans but by an alien race. Other scholars believe that they are relics of an ancient people who made drawings for the gods to be able to see them from the sky, and may even be a giant astronomical calendar.

4 – Sacsayhuaman

Sacsayhuaman is a walled complex close to the old city of Cuzco, which is at an altitude of more than 3,000 meters. There are three parallel walls built on different levels with limestone of enormous sizes.

These stones classify the walls as being either cyclopean or megalithic architecture. There are no other walls like these, and scientists have no idea how the blocks were transported. These giant stones have been fitted so perfectly that no blade of grass can slide between them.

3 – Stonehenge

Certainly one of the most fascinating places in the world, Stonehenge is a megalithic monument from the Bronze Age located on the Salisbury Plain in southern England.

It is composed of vertical stones – each more than 5 meters high and weighing 26 tons – arranged in a circle, with some containing other stones balanced horizontally at the top, also forming a circle. There is also an inner circle composed of high and low stones.

Stonehenge has a structure that allows, on equinoxes and solstices, the sun to rise on the horizon, seeming to be perfectly situated between the gaps of the megaliths. This, no doubt, was not done by chance and probably contributed to the stories of its mysterious origins.

Gerald Hawkins, an astronomy professor, concluded that Stonehenge was a sophisticated astronomical observatory and designed to predict eclipses. Some people believe that the place was used for mystical and religious ceremonies.

2 – Costa Rica stone spheres

One of the strangest mysteries in archeology was discovered in the Diquis Delta of Costa Rica. Since 1930, hundreds of stone balls have been documented at the site, ranging in size from a few centimeters to more than 2 meters in diameter.

Some weigh up to 16 tons and almost all are made of granodiorite, a magmatic rock similar to granite, and these objects are monolithic sculptures made by human hands.

1 – QueĆ³ps pyramid

The largest and oldest of the Giza Pyramids is the only one of the Seven Wonders of the Ancient world that survives substantially intact.

The pyramid is believed to have been built as a tomb for King Khufu’s fourth Egyptian dynasty (Cheops in Greek) over a period of 20 years around 2,560 BC The Great Pyramid was the tallest man-made structure in the world for more than 3,800 years.

Originally, this pyramid was covered with stones that formed a smooth external surface, but what we see today is the structure of the underlying nucleus, since the first one has been wearing out over time.

Some parts of the smoother coating that covered the structure can still be seen around the base. The scientific and alternative theories on the construction techniques of the Great Pyramid are varied, but none are assertively proven.