A small boat quay on a lake at the bottom of Turda salt mine in Turda, Romania (Daniel Mihailescu/AFP/Getty Images)
NEAT Gotthard Base Tunnel (Reuters/Arnd Wiegmann)
Kuha Karuhas pavilion, Thailand (Christophe Archambault/AFP/Getty Images)
G-CANS: Tokyo Storm Water System
German fortifications from the time of the Second World War (Rafal Marcinkiewicz, courtesy of Sony World Photography Awards 2011)
The Labyrinth in Budapest
The Labyrinth in Budapest
Excavation in the deposits of Atapuerca’s mountain range in Burgos, Spain (Reuters/Felix Ordonez)
The Hang Son Doong cave, Vietnam
Abandoned Salt Mine, Romania (photo by Marius R)
Stockholm metro
Delhi Metro Rail Corporation employees working on the rings of the underground tunneling project (MANAN VATSYAYANA/AFP/Getty Images)
Canoeing through Atlanta’s Krog Tunnel (© Caroline Smith)
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