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The “Sunken Palace” is one of the most striking remnants of Byzantine Constantinople and is the largest of hundreds of ancient underground reservoirs in Istanbul.

The “Sunken Palace” is one of the most striking remnants of Byzantine Constantinople and is the largest of hundreds of ancient underground reservoirs in Istanbul.

The “Sunken Palace” is one of the most striking remnants of Byzantine Constantinople and is the largest of hundreds of ancient underground reservoirs in Istanbul.

The “Sunken Palace” is one of the most striking remnants of Byzantine Constantinople and is the largest of hundreds of ancient underground reservoirs in Istanbul.