With the exception of being privy to exclusive tours of closed metro stations under construction in Warsaw in 1989 and Berlin in 1991, most of these photos were taken when traveling through Europe over many years with nothing but a simple pocket sized point-and-shoot camera, often kept concealed in order to capture spontaneous moments while traveling in undergrounds on a daily basis. There are also several photos taken inside of the New York Subway in 1992 and 2003.
