The video is right that Mohenjo-daro and Harappa were exceptionally large Bronze Age cities: Mohenjo-daro had an estimated population of at least 40,000, larger than many contemporary settlements in Europe and the Middle East.
But the claim that they "simply vanished" is too strong. Both cities declined and were largely abandoned around 1900 BCE; the evidence does not show a sudden, complete disappearance. Modern archaeological excavations began at Harappa in 1921 under Daya Ram Sahni and at Mohenjo-daro in 1922 under Rakhal Das Banerji, making "rediscovered" misleading.
Maya cities and Angkor also declined, but Maya and Khmer cultures did not disappear. These are major ancient urban centers that declined, not civilizations that vanished from collective memory.
Sources
Mohenjo daro: Unsealing an Ancient Indus City - Harappaharappa.comHe walks through the nearly five thousand year old city of Mohenjo-daro, discusses recent speculations about the Great Bath and the so-called Stupa mound, and ...
Mohenjo-daro! - Harappaharappa.comMohenjo Daro, or "Mound of the Dead" is an ancient Indus Valley Civilization city that flourished between 2600 and 1900 BCE.
4500-year-old urban planning at Mohenjo-darofieldstudyoftheworld.comMohenjo-daro had a population of 40000 people and it was the most advanced city in the world in terms of urban planning and especially sanitation.
Rediscovering the lost city of Mohenjo Daro - National Geographicnationalgeographic.comMohenjo Daro, built at the time of the pyramids and centuries before the Roman Baths, was the largest city of the Indus Civilization.
Compare and contrast early cities (Harappa and Mohenjo-Daro) and ...brainly.in... size Modern cities vary in size, from small towns to megacities. Population Mohenjo-daro is estimated to have had a population of 35,000 ...
Mohenjo-daroen.wikipedia.orgArea 240 ha (590 acres) With an estimated population of at least 40,000 people, Mohenjo-daro prospered for several centuries, , with major urban centers at ...
Mohenjo-daro | Definition, Harappa, Map, & Artifactsbritannica.comSome scholars have regarded Mohenjo-daro as a capital of an extensive state due to its size (about 3 miles [5 km] in circumference) and richness ...
Archaeological Ruins at Moenjodarowhc.unesco.orgThe ruins of the huge city of Moenjodaro – built entirely of unbaked brick in the 3rd millennium B.C. – lie in the Indus valley. The acropolis, set on high ...
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