13 historic monuments, puzzles which are still not solved

1. Stonehenge, England

The legendary magician Merlin is said to have erected the stone complex known as Stonehenge.

However, it's important to note that Stonehenge predates the mythical existence of King Arthur and his supposed companion.

One question that puzzles many is how ancient people managed to transport such massive stones from quarries located hundreds of kilometers away. The exact purpose of this monumental structure remains a mystery: Was it an astronomical observatory, meticulously aligned with the solar system, or a sacred site utilized by Celtic priests, known as Druids?