#10 Saksaywaman
The tuned up stack of these stones are mystery till date! Nothing, not even air can pass through these perfectly stacked up stones!

#9 Costa Rica’s Stone Spheres
There is a place in Costa Rica which has hundreds of granodiorite spheres present in sizes as small as 3 or 4 centimetres to even 3 meters. The archaeologists have no clue about what they are!

#8 The Tunnels from the Stone Age
These man-made tunnels were carved during the stone age, but how they were carved this finely without any tools are still mystery to the world!

#7 Yonaguni Monument
These 90 degree angular formations as well as flat edges on this structure are located off the coast of Yonaguni, Japan. But whether they are man-made or natural formation is still a mystery

#6 The Voynich Manuscript
This manuscript is written in a language beyond human understanding. No one till date has been able to decode this manuscript!

#5 The Gobekli Tepe
This temple is located on the top of a mountain ridge in Turkey. The city was built nearby this temple after its construction. This tells a lot about the customs and practices of our ancestors.

#4 L’Anse aux Meadows
The existence of this archaeological site dates back to the year 1000. It was founded in the year 1960 making people believe that trans-oceanic contacts prevailed ever before Columbus.

#3 The Longyou Grottoes
Found in the year 1992, these man-made caves are believed to be formed during the Qin Dynasty of 212 BCE. There are 24 such caves but when and how they were made is still dubious!

#2 The Mount Owen Moa
This flightless bird became extinct some 500 years ago. But a well preserved claw of this bird was found in one of the caves of New Zealand shocking the researchers. It dates back to 3000 years ago!!

#1 The Gate of the Sun
Finally, this structure, which is carved out of a single stone is built nearly 1500 years ago. The carvings and engravings on this structure are still hard to decode! Some scientists beleive that these carvings are of astrological importance, but nobody is 100% sure of them!
Really, Earth has strange hidden treasures in it!