Bath stone is a type of rock that is found in Bath, a city in England. It is a special type of limestone which is really good for building things because it is strong and easy to carve.
Bath stone is kind of like a big puzzle piece that fits together with other pieces really well. If you want to build a big building, construction workers can chip away at the stone to make it into the shape they need. They can also make patterns or decorations on it pretty easily.
People have been using bath stone for a really long time – even ancient Romans used it to build their buildings! Today, we can still see buildings made of bath stone in England, and it's really pretty to look at.