Stoneheads
One of the most interesting features of Terra Nova is its ruins of giant stone heads, carved with lasers and carefully polished. It is assumed that most were erected in the early years of colonization by settlers.
Not only were these monumental stone works in fashion at the time, but they were thought to bring good luck to the person building them. Moreover (although no one would admit to it), the Stoneheads could have served as a sort of cosmic “Killroy Was Here” marking to show Mankind’s presence on the newly colonized planet.
Stone sculptures ceased to be in fashion about a century after the colonization began. Thus, only the oldest settlements have them. Almost all are badly damaged since nobody but archaeologists care about them anymore.