Tetrapylon

A tetrapylon is a special kind of structure that has four pillars or columns, one at each corner. It usually looks like a square, and there might be a roof on top or some decorations. Think of it like a little room without walls, but with four big posts holding it up.

Some people build tetrapylons because they look fancy and impressive, or because they mark an important spot. Others might use them as a shelter from the sun or rain. You might see tetrapylons in parks or public places, or even in ancient ruins!