Machu Picchu
In his novel "Slapstick" Kurt Vonnegut quips:
"...there must have been days of light gravity in old times, when
people could play tiddley winks with huge chunks of stone."
Pedro de Cieza de Leon wrote of an old Inca legend about the creator-god,
Viracocha. Once to show his power he caused a huge fire, then extinguished
it. As a result of having been burnt so, the stones were so light that even
a large one could be picked up as though it were made of cork.