Baltic Sea Anomaly ~ This HUGE object is still being investigated, but the resemblance to Han Solo’s Millennium Falcon. The fact that it seems to be composed of natural minerals raises the odds of it being some kind of a natural rock formation.
Step Pyramid, Saqqara: the oldest known of Egypt's pyra-mids. BC for Djoser of Dyn 3 by the architect/ genius Imhotep. It is a vast mortuary complex surrounded by ceremonial structures in an enormous courtyard