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10 underground tours full of history and mystery

Istanbul cistern

Photo: OzMark17/Flickr

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Istanbul cistern

Constructed in the sixth century (on the location of a smaller cistern that was even older), the Byzantine Cistern in Istanbul, Turkey, is one of the most visually stunning underground attractions on our list. The experience of seeing this historic place is enhanced by the use of spotlights, which illuminate the cistern's trademark pillars and create reflections in the water that still flows into this ancient structure. The cistern is open daily, and there are special events, such as classical music concerts, that take place here.