Part I. Creation. Waitomo Caves, New Zealand ; Yucatan Cenotes, Mexico ; Postojna Cave, Slovenia ; Veryovkina Cave, Georgia ; Kazumura CAve, USA ; Cueva de Villa Luz, Mexico ; Pando, USA ; Dark Star Cave, Uzbekistan ; Palaeoburrows, Brazil
Part II. Ancient history. Chauvet-Pont d'Arc, France ; Derinkuyu, Turkey ; Mausoleum of the First Qin Emperor, China ; Herculaneum, Italy ; Labyrinthos Caves, Greece ; Tenochtitlan, Mexico ; Basilica Cistern, Turkey ; Elephanta Caves, India ; Qumran Caves, Israel ; Cueva de los Tayos, Ecuador
Part III. Modern history. London Underground, United Kingdom ; Tunnel 57, Germany ; Burlington, United Kingdom ; Coober Pedy, Australia ; Cu Chi Tunnels, Vietnam ; Camp Century, Greenland ; Great man-made River, Libya ; Sonnenberg, Switzerland ; Darvaza Gas Crater, Turkmenistan ; G-Cans, Japan
Part IV. Today. Large Hadron Collider, Switzerland/France ; Otay Mesa, USA/Mexico ; Guatemala City Sinkholes, Guatemala ; Svalbard Global Seed Vault, Norway ; Helsinki Underground City, Finland ; Kolwezi Mines, Democratic Republic of the Congo ; Jerusalem Cemeteries, Israel ; Concordia Research Station, Antarctica ; Los Angeles Tunnels, USA ; Hellisheidi, Iceland.
