"The Shell Grotto Is An Ornate Subterranean Passageway Shell Grotto In Margate, Kent, England. Almost All The Surface Area Of The Walls And Roof Is Covered In Mosaics Created Entirely Of Seashells, Totalling About 2,000 Square Feet Of Mosaic, Or 4.6 Million Shells"
Given all the historical evidence available, empirical and anecdotal, it is, and always will be, the most logical conclusion.
me- "Oooh, right. The walls. The walls for Kuzco. The walls chosen specially to protect Kuzco. Kuzco's walls.... Those walls?"
Also, dinosaurs existed all over the planet and when people discovered the fossils, they had no idea what they were. This explains why mythical creature legends (like dragons) exist in almost every ancient culture.