The Hanging Gardens were supposedly built by Nebuchadnezzar II, but the exact layout is still a mystery. The most common theory is that they were terraced walls—like a giant step garden—filled with exotic plants that were somehow watered by an early form of aqueduct. Imagine a vertical garden, with vines crawling up stone walls, and a system that pumped water from the Euphrates, all while the city below looked like a living painting. It’s fascinating how the ancient engineers solved the irrigation puzzle, and the whole thing becomes a blend of engineering, horticulture, and art all at once.