In the prior series of posts, I submitted my favorites. Here are a few others that deserve recognition:
The Serapeum of Saqqara: 24 giant sarcophagi, each weighing 100 tons! See details at:
https://www.ancient-origins.net/unexplained-phenomena/serapeum-sarcophagi-021992
Derinkuyu: A massive ancient underground city that housed up to 20,000 residents. See details at: https://en.wikipedia.org/wiki/Derinkuyu_underground_city
Petra Jordan: Inhabited as early as 7,000 BC.
See details at: https://en.wikipedia.org/wiki/Petra
The Antikythera mechanism: The Antikythera mechanism is an ancient Greek hand-powered analog computer which has also been described as the first example of such a device used to predict astronomical positions and eclipses for calendar and astrological purposes decades in advance. It is estimated to have been built in the late second century BC[5] or the early first century BC. See details at: https://en.wikipedia.org/wiki/Antikythera_mechanism
The Basílica de la Sagrada Família
On 19 March 1882, construction of the Sagrada Família began under architect Francisco de Paula del Villar. In 1883, when Villar resigned, Gaudí took over as chief architect, transforming the project with his architectural and engineering style, combining Gothic and curvilinear Art Nouveau forms. Gaudí devoted the remainder of his life to the project, and he is buried in the crypt. At the time of his death in 1926, less than a quarter of the project was complete. The project is projected to be completed in 2032, 150 years after it commenced. For more details see at: https://en.wikipedia.org/wiki/Sagrada_Fam%C3%ADlia
The Burj Khalifa
The Burj Khalifa known as the Burj Dubai prior to its inauguration in 2010, is a skyscraper in Dubai, United Arab Emirates. With a total height of 829.8 m (2,722 ft)See more details at: https://www.burjkhalifa.ae/en/the-tower/facts-figures
The Chunnel
The Chunnel, is a 50.45-kilometre (31.35 mi) railway tunnel that connects Folkestone (Kent, England, UK) with Coquelles (Hauts-de-France, France) beneath the English Channel at the Strait of Dover. It is the only fixed link between the island of Great Britain and the European mainland. At its lowest point, it is 75 m (250 ft) deep below the sea bed and 115 m (380 ft) below sea level. At 37.9 kilometres (23.5 mi), the tunnel has the longest underwater section of any tunnel in the world. The speed limit for trains through the tunnel is 160 km/h (100 mph). For more details see at: https://en.wikipedia.org/wiki/Channel_Tunnel
The Coral Castle
Created by just one man working alone for 28 years until his death in 1951. He was a Latvian immigrant named Edward Leedskalnin who stood, it is said, 5 feet tall (1.5 meters) and weighed 100 lbs. (45 kilograms). Legend has it that he was inspired to build the structure after being abandoned by his 16-year-old sweetheart on what was to be their wedding day. Spurned by his lost love, he set out to prove to her — and the world — that he could do something remarkable, and make something of himself despite his poverty and fourth-grade education. And he succeeded spectacularly. For more details see at: https://www.livescience.com/41075-coral-castle.html
