One of my favorite spots in Istanbul was underground. The impressive cistern system under the city is on display at the Basilica Cistern near the Hagia Sopia, but it's easy to miss. They've done an incredible job with the atmosphere down there with walkways above the water and around hundreds of columns lit from below. Perfect amount of spook and awe. Be sure to hunt down the Medusa capitals in the back.
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The Cistern is an incredible sight-- underground and from the 6th century, it's worth the 10 Liras to go in. Make sure you check out the upside down Medusa sculpture hidden in the back. Oh, and it's surprisingly not smelly. Check it out!