Mohenjo-daro

The first excavations were carried out only in the 1920s by the English archaeologist, John Marshall.

An excerpt from the article 26 facts about Mohenjo-daro
But as early as 1856, workers building a railroad that ran along the Indus Valley encountered many fire-burnt bricks. Not realizing they had ancient artifacts in their hands, they used them in the construction. Soon, among the bricks, they also began to find items made of soapstone, some with high artistic value. Without knowing it, these workers stumbled upon traces of the Indus civilization, also known as the Harappan civilization, from Harappa, the first excavated settlement in British India, presently in Pakistan.