Peru: it's really big. Not just across, but up-and-down, and then-and-now. You can visit islands where wars were fought over who got to own the birdshit:
You can drive across arid desert for hours, were no rain has fallen in a thousand years to wash away the giant prehistoric graffiti,
or go up (and up and up) and inside an hour switch from blistering heat to glacier country.
You can visit islands made of reeds, floating on a chilly lake on the roof of the world,
and then drop back down again into Amazonian rain forest that is just indescribably hot and muggy. And heaving with bugs.
And Peru is full of Stuff. Lots of this Stuff is actually left over from the ancient Incans, who - as well as inventing yellow cola - were famous for their astonishing stonework. They littered the place with fabulous citadels like this:
This wall, still standing despite 500 years of earthquakes, was carved without iron tools and laid without mortar. Every one of those huge stone fits the next to within a milimeter.
That much focus is only possible if you are on coca - which is still perfectly legal there. We drank a lot of coca tea to combat altitude sickness. Well, that was our excuse.
I climbed that! :-)