mound-builder

archaeologists study the mysterious mounds built by mound-builders.

the mound-builder culture left behind impressive earthworks and burial mounds.

researchers are trying to identify the mound-builder people and their origins.

many mound-builder sites are now protected as historical landmarks.

the purpose of the mound-builder structures remains a subject of debate.

evidence suggests the mound-builders were skilled engineers and architects.

the complex mound-builder society had a sophisticated social structure.

radiocarbon dating helps determine the age of mound-builder constructions.

the mound-builder traditions were passed down through generations.

excavations at mound-builder sites often reveal valuable artifacts.

the impressive scale of the mound-builder earthworks is truly remarkable.