Buckingham Palace's architecture is like a time capsule of materials that tell its story! It started out in 1703 with Bath stone, a warm, honey-colored limestone that gives the palace its signature charm. Then, in the 19th century, John Nash added Portland stone, known for its elegance and durability—plus, it's made of tiny marine microbes from ancient times! Over the years, renovations brought in Caen stone, though it had a few hiccups with durability. All these materials together create a stunning, ever-evolving masterpiece that's stood the test of time.