The Pyramids of Egypt: The construction of the pyramids in Egypt remains a mystery, as it is unclear how the ancient Egyptians were able to build such massive structures without modern technology.
Stonehenge: Stonehenge is a prehistoric monument located in England, and its purpose and construction remain a mystery.
The Voynich Manuscript: The Voynich Manuscript is an illustrated book from the Middle Ages, written in an unknown language and alphabet, that has never been deciphered.
The Antikythera Mechanism: The Antikythera Mechanism is an ancient Greek analogue computer that was used to predict astronomical positions and eclipses.
The Lost City of Atlantis: Atlantis is a legendary lost city that was said to have sunk into the ocean, and its existence has never been proven or disproven.
The Nazca Lines: The Nazca Lines are a series of ancient geoglyphs located in Peru, and their purpose and construction remain a mystery.
The Hanging Gardens of Babylon: The Hanging Gardens of Babylon were a marvel of ancient engineering, but their location and existence have never been definitively proven.
The Bermuda Triangle: The Bermuda Triangle is a region in the western part of the North Atlantic Ocean where numerous ships and planes have disappeared without a trace.
The Easter Island Statues: The Easter Island Statues, or moai, are a series of large stone statues located on Easter Island, and their purpose and construction remain a mystery.
The Sphinx: The Sphinx is a massive statue located in Egypt, and its true age and purpose remain a mystery.