On Earth, there are extremely strange ancient structures that scientists cannot decipher. Could these be the “works” of aliens?

Was this a strange structure built by aliens when they arrived at Trai Dat?
In 1985, a Japanese diver, while working in the sea near Yonaguni Jima Island (near Taiwan), accidentally discovered a massive ancient stone structure.

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At the center of the complex today is a 27m high pyramid, surrounded by 10 smaller structures. The Yonaguni complex is located 30m below the surface of the water, so experienced divers can still access it. Schools of great hammerhead sharks often swim through here during their migration from November to June every year. The mysterious constructions built by aliens when they arrived at Trai Dat?-Picture-3
The giant staircase here was built from a series of 1m high stone layers, like the steps of a pyramid. Therefore, the locals always believe that this is a giant construction like a pyramid under the sea that could be built by aliens.

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The Georgia Guidestones are instructions created for future generations. These commandments, including rules such as “Keeping humanity under 500,000,000” and “Guidelines for wise reproduction, physical improvement and diversity” are written in 8 languages and are all engraved on stone. The Mysterious Constructions Made by Aliens on Earth?-Picture-5
Until now, no one, including scientists, knows who made these stones, why they did it. The entire Georgia Guidestones are giant slabs of stone in the middle of nowhere in Georgia, and they were created by a man who calls himself “Robert Christian”.

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This man represents an entire anonymous group that believes that human civilization is about to self-destruct, so they decided to leave instructions for those left on Earth.
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Scientists have discovered that in the arid desert of about 500 square kilometers between the towns of Nazca and Palpa in Peru, there are more than 300 drawings of animals such as hummingbirds, monkeys, spiders, lizards, mazes, humans or other strange geometric shapes. These drawings date back to 1,000 years BC or earlier.
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These line drawings have existed for 3,000 years without being destroyed. It is estimated that modern science and technology would have difficulty carrying out such constructions, let alone thousands of years ago.
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Easter Island is an island famous for its 887 giant stone statues with human faces (called Moai), under the sovereignty of Chile in the Southeast Pacific. It is known that these statues were created by the ancient Rapa Nui people. The Moai statues weigh up to 75 tons and are about 10 meters high, with one weighing 270 tons and 21 meters high.
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To this day, scientists are still puzzled by the question of why the Rapa Nui people built the Moai statues, and how they moved the giant statues buried all over the island. A series of mysterious structures built by aliens when they came to Trai dat?-Picture-11
Puma Punku is located in Tiwanaku, Bolivia. The giant stone slabs are elaborately carved, perpendicular, and have a smooth surface like large, carefully planed wooden planks. These sites, dating from 536 – 600 AD, are made of granite and diorite, which is second only to diamond in hardness.
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If you look closely at the stone slabs, you can see some complex stone structures, as if they were created by machines or even laser cutting equipment. Many people believe that aliens with advanced techniques created these massive structures, or at least advised the indigenous people to build them.