Day 10 : Observation Challenge
Day 14 : Restoration challenge
Day 17 : Observation challenge
Day 20 : Restoration challenge
Day 24 : Observation Challenge

There are three questions:
1: What is the name of that oft gilded symbol?
Answer: Fleur de Lis
2: What is the name of the famous da Vinci drawing?
Answer: Vitruvian Man
3: The twenty-six letters allow for almost 12 million possible password combinations. Can you tell how many dials it has?
11,881,376/26n = 5
Screenshot for Day 3, here.