article_snippet.sent: Three entrances to the impressive complex can be seen, leading to vast, winding tunnels .
article_snippet.sent: The multilevel settlement is likely to include living spaces, kitchens, wineries, chapels, staircases, according to a report in National Geographic.
article_snippet.sent: Scientists have yet to discover all its secret passages .
article_snippet.sent: Derinkuyu had areas for sleeping, stables, wells, kitchens, ventilation shafts, tombs, communal rooms, bathrooms.
article_snippet.sent: Pictured on the left is one of the left corridors and on the right the excavation site .