It costs 10TL and the line gets long, so get there early. It's also nearby the other sights, such as the Ayasofya, Blue Mosque, Topkapi Palace, etc.
It's fairly dark in there and smells musty. But, the sheer enormity of the cavern and the columns takes your breath away. I would suggest wearing tennis shoes since there are parts of the walkway that are wet and can be slippery.
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