Architectural sculpture is kind of like big, 3D art that is usually found on buildings or other structures. It can be made out of all sorts of materials, like stone, bronze, or even wood.
The sculptures are often designed to fit in with the architecture of the building they're on, so they can look like they're really a part of the building itself. Sometimes they're really intricate, with lots of details and patterns, and sometimes they're simpler and more abstract.
People have been making architectural sculpture for a very long time, dating back many thousands of years. The ancient Greeks and Romans were really good at it and made some amazing sculptures that are still around today.
Architectural sculpture can be used to tell stories or show important people or events, or it can be used just to make a building look nicer. Some sculptures are so big that they're basically buildings themselves and you can even go inside them, kind of like a big sculpture-shaped room.
Overall, architectural sculpture is a really cool way to add some art and beauty to buildings and other structures, and it's been around for a very long time!