Cairo, Egypt (CNN)If you think New York never sleeps, you should try Cairo sometime.
Ear-splitting, pulse-pounding and overwhelming, Egypt's capital is an all-out assault on the senses -- 18 million hustling, bustling people packed into one heaving city along the banks of the Nile.
Egyptians call it the "Mother of the World," and it's not hard to see why. Cairo is a modern megalopolis with an ancient past -- a living, breathing and sweating testament to city's thousand-year old role as the main nerve center of the Arab world.
But enough out of us -- we asked you to finish the following sentence: "You know you're in Cairo when..."
... and boy did you answer. You gave us the lowdown on city: the sights, the sounds and the smells.
Here are 13 signs you're probably in the Egyptian capital, chosen by you.