Way back in November 2000, I featured on my weekly page Alberto Burri's Cretto, a massive piece of land art that sits atop the ruined remains of Gibellina, a Sicilian town destroyed by earthquake in 1968.
Click for Google Earth link
Gaps in the concrete masses follow the streets of the old town, linking the present to the past in an artistic and abstract way.
This is one of those things that sticks with you for a long time; I know it has stuck with me. It's a simple idea, but one that's impressive on multiple levels: from the air, from nearby, within the concrete voids, within the mind.