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Which archaeological remains did Robert Koldewey think might have been connected to the Hanging Gardens?

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Reconstructed Ishtar Gate at Babylon near Al-Hillah, Iraq, featuring blue walls decorated with rows of yellow and white animal reliefs and a central arched entrance. — Babylon A reconstruction of the Ishtar Gate at the ruins of Babylon, near modern Al-Ḥillah, Iraq.

German archaeologist Robert Koldewey believed he had discovered the remains of the Hanging Gardens of Babylon after uncovering a unique series of foundation chambers and vaulted structures in the northeastern corner of the royal palace at Babylon.123

Within these vaults, Koldewey found a well that he hypothesized may have been used in conjunction with a chain pump to irrigate the gardens, leading him to suggest that these chambers served as the substructure for the legendary site. While his discovery remains a significant archaeological find, it is important to note that no conclusive evidence has confirmed the location of the Hanging Gardens, and some modern researchers theorize that the gardens may have actually been located at Nineveh under the Assyrian king Sennacherib.23