With billions of dollars on the line, however, archaeologists responded quickly to the unexpected discovery in March. They began excavating the site, searching for more relics from the distant past.

In a short period of time, a team of thirty people, including geologists, technicians, palaeontologists, and restorers, ascertained that this future development project would sit on top of what turned out to be a unique site, on top of it.

A priceless place, archaeologists plan to warn the Madrid City Council that they should have left the plot as an archaeological reserve to investigate further in the future, Juan Sanguinos, one of the project researchers, said in The Olive Press.

Construction workers happened to uncover incredibly ancient footprints in the Mendez Alvaro district of Madrid. And not only human either. Among the living creatures that visibly walked upon this Earth 26,000 years ago are rhinoceros and herbivores.

The company spearheading the housing project responded appropriately by alerting local archaeologists. Upon closer investigation, they found stone relics also 26,000 years old leading archaeologists to identify the site as a Pleistocene settlement.

In other words, from the Ice Age.

After surveying 2,000 square meters, or about half an acre, the paleosurface revealed that several rivers had merged here. Thus, animals and humans came to drink, which explains the presence of footprints. Furthermore, excavation head Pilar Oñate told The Olive Press that this site was far more than a drinking well but also a “unique settlement.”

“Something like this was not known about in the centre of the Iberian Peninsula, but previously only on the Cantabrian coast and generally in cave areas and shelters, rather than being in the open air.”

One footprint ended up being a mere step to opening up a new world that sheds new light on our very ancient ancestors. The clock is ticking, all the same, so archaeologists sent a drone into the air to take photographs and 3-D images of the site, Express UK writes.