This is Chand Baori, a 13-story deep step well located in India in a village called Abaneri, approximately 60 miles from Jaipur. The well was named for King Chanda, who controlled the area in the late eighth and early ninth centuries.
Also part fort — designed with openings in the walls for muskets and with four corner watchtowers — the well has 3,500 steps descending to the cool water below. Chand Baori is one of the deepest and largest structures of its kind.
See a video on Chand Baori below, and learn about six other lesser-known architectural wonders of the world at BBC Travel.
Image: Wikimedia Commons
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