The ancient artifacts below suggests people from the future (or people from our time) were able to travel back in time, see for yourself:
Quimbaya 'Airplanes'
Photo source: here
The Quimbaya artifacts are golden objects found in Columbia. These are believed to have been made by the Quimbaya civilization in around year 1000. Among the Quimbaya artifacts are the airplane-like things called the Quimbaya Airplanes. People back in that period have no knowledge or technology to create airplanes, and we're 100% sure they haven't seen one. But how did they come up with this sophisticated design?
In 1994, Conrad Lubbers and Germans Peter Belting created simple radio-controlled models of these artifacts and they were able to show that the engineering and construction of these ancient Airplanes could allow flight. They believe these planes were made by either ancient astronauts or some time travelers - or it could be just their take on a weird looking fish.
Iron pillar of Delhi
If you have a car, and you regularly get rust-proofing, then you would be eternally jealous of the rust-resistance of this century-old pillar. This iron pillar is located in Delhi, India. It measures 7m (23 ft) tall and stands in the Qutb complex. This pillar possesses very advanced rust-resistant composition for something made back in 912BC.
Photo source: here
Metallurgists and archaeologists are in disbelief as this pillar got it resistance to corrosion and rust from an even layer of crystalline iron hydrogen phosphate forming on the high phosphorus content iron, which protects the pillar from the local Delhi climate. IMPRESSIVE.
Baghdad Battery
Sometimes called the Parthian Battery, the Baghdad Battery is the given common name for a number of artifacts created in Mesopotamia, during the era of the Sassanid or Parthian dynasties or the Persian Empire period (early AD), and discovered in 1936 near Baghdad, Iraq. Believe it or not, these pots are fully functional batteries.
These batteries have galvanic cells, this is a technology not available even hundreds of years afterwards. These batteries predates Alessandro Volta's historical 1800 invention of the first electrochemical cell by more than a millennium! It is believed that the people who made this battery used it to electroplate gold on silver objects. Too bad they didn't patent it.
Photo source: here and here
The Nazca Lines
Remember those times when you were a kid and you wave to airplanes thinking they can see you? Well they can't see you - but people on planes can definitely see the Nazca Lines.
In the Nazca Desert in southern Peru, a series of ancient geoglyphs exists and is called the Nazca Lines. These are figures drawn on the ground by removing the reddish pebbles and uncovering the whitish/grayish ground beneath. Scholars believe that the Nazca Lines were made by the Nazca culture in around 400-650 AD.
Photo source: here and here
These drawings spans up to 80 kilometers (50 miles) and covers nearly 500 square kilometers (19 sq mi) across. This work is widely believed to be extremely hard to draw without the aid of an aerial view. Why and how the Nazca people created these drawings are unknown up to this day. They are now designated as one of UNESCO World Heritage Sites.
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