Bell Rock Construction

What material was primarily used in the outer casing of the Bell Rock Lighthouse during its construction? 🧱
Difficulty: Easy
🛠️ What innovative method, inspired by church architecture, was adopted for connecting the stones in the Bell Rock Lighthouse?
Difficulty: Medium
🌊 To manage the challenging tidal conditions during the Bell Rock Lighthouse's construction, what surprising procedure, involving an alteration to the surrounding environment, was implemented?
Difficulty: Hard