Almost 1,000 moai statues can be found on Easter Island in the Pacific Ocean.
Because the carvings on the hats of the moai are all written in the same language, we know that they were made by the same group of people.
Some people claim that the patination on the moai means that they could have been built many millennia ago.
Easter Island is the only place on Earth where huge rocks are placed together without using mortar to form walls.
The Nazca Lines can be found in the modern day country of Peru.
Our modern understanding of the Nazca Lines is based on an archaeological finding from about 100 years ago.
Travelers in the 1500s believed that the Nazca Lines were created by alien spacecraft.
The Nazca Lines can only be seen from an airplane.
One reason why some people believe that aliens had something to do with the Nazca Lines is that at least one of the drawings looks like an astronaut.
Archaeologists have found mummified remains of the Nazca people.
The fact that many of the mummified heads were elongated suggests that they were originally from another planet.
Researchers are pretty sure that the 2017 discovery of a three-fingered mummy was actually a hoax.
The Nazca Lines could only be drawn with advanced technology that wasn't invented until at least the 1500s.
One reason why the Nazca Lines have lasted so long is that the area of Peru that are in is practically "weather-less."
Most of the Nazca Lines are very realistic depictions without exaggeration or dramatization.
Some people interpret the extra large construction at Sacsayhuaman to mean that it was built by giants.
Experts know exactly how Sacsayhuaman was built.