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10 Strange Discoveries We Still Have No Explanation For

The world we live in is full of mysteries. How did the dinosaurs die? What other strange creatures inhabited the Earth at one time? How did ancient humans build some of the remarkable monuments they constructed without the aid of modern technology? While we won't pretend to have the answers to these and many other questions, it's always interesting to ponder some of the more bizarre mysteries that lay just beneath the surface.

1. Moa Birds

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Moa were large, flightless birds that were native to New Zealand until they went extinct somewhere in the early 1500s. The prevailing theory is that they were likely killed off by the indigenous Maori people. The best-preserved remains of these birds are in the form of a very large claw that scientists unearthed by accident.

2. Temple Complex of Saksaywaman, Peru

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This temple complex features perfect stonework that was completed without the use of mortar. The stones fit together so perfectly, there are places where you can't even pass a sheet of paper between them. What's even more impressive are the smooth, rounded edges and corners of the stones.

3. Gate of the Sun, Bolivia

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The Gate of the Sun is located in the ancient Bolivian city of Tiwanaku. Some archeologists theorize that the gate was the center of a massive, ancient empire. The carvings on the gate remain undeciphered but are believed to have astrological/astronomical significance.

4. Longyou Caves, China

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This massive cave system was carved out of sandstone by human hands. The overall scale of the caves suggests it would have required thousands of workers, yet there is no mention of the project anywhere in historical records.

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5. Unfinished Obelisk, Egypt

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This massive obelisk was carved straight out of the rock face, but it looks as though it started to crack midway through the construction process, and was subsequently abandoned. 

6. The Underwater City of Yonaguni, Japan

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This massive, ancient complex was discovered by Kihachiro Aratake, a diving instructor. The city has become a source of great fascination for researchers, and the rocks from which it was carved became submerged some 10,000 years ago - well before the Egyptian pyramids were built!

Some researchers believe that people of this time were too primitive to have built anything of this nature, making the site all the more mysterious.

7. Mohenjo-daro, Pakistan

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This ancient city was discovered by Indian archaeologist R. D. Banerji in 1922. The city shows an incredibly advanced level of planning, but very little evidence has been found to indicate what caused the downfall of this great city, or where its inhabitants went.

8. L’Anse aux Meadows, Canada

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This archaeological site in Canada provides evidence of Viking settlers arriving in the New World over a thousand years ago. This means Scandinavian explorers had discovered America long before Columbus.

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9. Stone-Age Tunnels

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Scientists have discovered vast networks of tunnels throughout Europe, all the way from Scotland to Turkey. This suggests that stone-age communities were decidedly more complex than being mere hunter-gatherers. Still, very little is known about the true purpose of these tunnel systems. The most likely explanations are that they were a means of travel that offered protection from predators and the elements.

10. The Stone Spheres of Costa Rica

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These perfectly round stone spheres are intriguing not just because of their shape, but also their mysterious origins and purpose. First discovered in the 1930s by workers clearing out land for a banana plantation, they were initially believed to contain hidden gold. Unfortunately, they turned out to be empty.

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H/T: Bright Side

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