One of things that baffle me is the Ica stones in Peru.
Dr Cabrera have collected about 11,000 stones with carvings of men riding dinosaurs, using advance technology and ancient maps with continents that no longer exist.
The Ica stones had been labeled as a hoax. But if these stones are authentic than there are two possible explanations:
1. Dinosaurs survived the mass extinction 65 million years ago and co exist with humans.
2. Humans existed during the age of the Dinosaurs.
Here are few links about the Ica stones
There is another artifact which suggest the same thing, human and dinosaur coexisted long time ago. Ancient Clay figures of dinosaurs were discovered in Mexico.