The Nazca lines are considered as drawings on the ground.They are huge parallels lines that run for miles.
They are in the Pampa region of Peru, an uninhabited area of the Peruvian coast .These lines were discovered in 1920's when the first airlines started to flying around Peru desert.
Skulls and Skeleton are used for Day of the Dead because they playful symbol of life after death, many times representing those who have died engaging in their favorite activities.