These Signs Of Early Civilizations On Earth Still Can't Be Explained
The Longyou Grottoes
These manmade caves, carved from siltsotne and found in China, remain a bit of a mystery. They are thought to date back before the Qin Dynasty (in 212 BCE) but, there is no record of them.
The Gate Of The Sun
Like Stonehenge, The Gate of the Sun is a stone structure that remains a bit of a mystery to this day. Coming in at 13,000 feet, the area in Bolivia may be where the first humans on Earth originated from. The engravings on the gate are thought to hold some kind of astrological and astronomical importance.
L'Anse aux Meadows
This 1,000-year-old site in Newfoundland, Canada proves that Viking settlers made their way to North America long before Christopher Columbus even thought about sailing to India.
This site, which was found atop a mountain ridge in Turkey, did a lot to further our understanding of development of ancient customs. The temple was built before the city around it, show just how highly valued religion was to those who settled.
The Voynich Manuscript
The Voynich Manuscript is a mystery that remains to this day, with plenty of theories as to what language it is written in. In 2014, two different groups came forward claiming to have solved the puzzle. The only problem was they both had completely different views. One believed it was an extinct Mexican dialect, while another thought it was a coded Asian language.
There is still debate on whether or not this huge underwater structure was man-made or somehow natural forming. It sits off the coast of Yonaguni, Japan and contains flat edges as well as 90 degree angles.
Stone Age Tunnels
This huge network of underground tunnels is completely man-made, and dates back to the Stone Age. Questions remain how they were able to build such an extensive system at that time.
Costa Rica's Stone Spheres
There are hundreds of granodiorite spheres across Costa Rica that go from very tiny (three or four centimeters) to fairly large (three meters). Archaeologists truly have no idea what they are for.
An Unfinished Obelisk
This obelisk was carved directly from bedrock, but after cracks appeared in granite, building of the obelisk was abandoned.
This site in Sindh, Pakistan is one of the earliest major urban settlements, with signs of both city planning, social organization and a draining system. An estimated 40,000 people lived in the area.