Did Spanish and Portuguese explorers come to the Americas looking for treasure?

Yes. The desire for treasure or material gain, was one of the main motivation.

Spanish and Portuguese explorers embarked on journeys in the fifteenth and sixteenth centuries primarily spurred by economic incentives that promised great riches and potential glory for both themselves and their countries.

What dates were they in mound builders existence that we know of?

Where is the Coto Laurel Library in Ponce located?

The Nebra sky disk may be the earliest known portable astronomical instrument
The Nebra sky disk is a unique prehistoric bronze and gold object that some interpret as an astronomical tool, but whose actual function is not entirely clear. It was discovered by two treasure hunters in 1999, on a hill (Mt. Mittelberg) in the Ziegelroda Forest near the town of Nebra (Saxony-Anhal
History of Vienne (Isère)
The City of Vienna conceals a rich historical heritage, its location, at the confluence of the Rhône and the Gère, at the convergence of the axes of circulation between the Alps and the central massif, and its hilly topography offering promontories, have made it a place of human settlement. from pro
Researchers shatter the myth of the lost civilization of Cahokia, a vast Native American city at the heart of many fantasies
The city of Cahokia, which was one of the most powerful cities in North America before European colonization, has neither disappeared mysteriously nor suddenly, according to the latest findings of anthropologists. Something to shatter a little more received ideas about the past of an exceptional Ame
Great Britain:an unknown migratory wave from France 3000 years ago
An extensive genomic analysis has revealed the existence in Great Britain of an unknown migratory wave that came from France during the Bronze Age. A ribcage like wings... This Bronze Age individual unearthed at the archaeological site of Cliffs End Farm, in Kent, could have been part of the impor