Architecture is one of photography’s favourite subjects. Buildings, bridges and other structures pose a nice challenge for the photographer: how to make something rigid and motionless appear interesting and new. Playing with lines, perspectives, shapes and light means that no two pictures look the same. In this respect, tunnels are some of the most fun structures to play around with for photographers. The perspective of depth draws the viewer in, there are plenty of curved and straight lines to work with, and the light can variably create an eerie, mysterious or hopeful effect. Here are some of the most transfixing examples in our database.