Stand enormous stones up vertically.
figure out ways to lift things is one answer- but there is much more to Stonehenge than 'lifting things'
carve things
Well - move heavy stones is the obvious answer, but in the case of Stonehenge also to apply quite extraordinary buildong and surveying skill - http://en.wikipedia.org/wiki/Stonehenge Transport large stones over considerable distances and then erect them using only, allegedly, primitive tools.
The discovery that very large and heavy stones at Stonehenge and that very large and heavy Moai heads at Easter Island had been moved great distances are viewed as remarkable. These examples of early mans' ability to transport large and heavy pieces of stone over considerable distances, and the ability to erect these same stones in their chosen location, using only primitive tools allegedly would prevent serious problems today, even for people equipped with heavy machinery.
Yes, they are both pretty remarkable achievements and even using modern technology they would be very difficult to replicate.
The discovery that very large and heavy stones at Stonehenge and that very large and heavy Moai heads at Easter Island had been moved great distances are viewed as remarkable. These examples of early mans' ability to transport large and heavy pieces of stone over considerable distances, and the ability to erect these same stones in their chosen location, using only primitive tools allegedly would prevent serious problems today, even for people equipped with heavy machinery.
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The discovery of penicillin
Internet.
A trilithon is a structure having two vertical stones supporting a third horizontal stone as seen at Stonehenge. This comes from the Greek words "tri" (three) and "lithos" (stone).
There are many discoveries in physics that can be used as examples. The best would be the WMAP mission which discovered that the cosmic microwave background radiation fit the theoretical model almost perfectly.
These discoveries are examples of hard work, scientific passion, intelligence, patience etc.