This volume is the catalogue of the exhibition of Bernd & Hilla Becher and Robert Smithson at the Museu de Arte Contemporânea de Serralves, Porto, from 30 November 2001 to 3 March 2002. The exhibition, curated by James Lingwood, brought together specific groups of works by Robert Smithson and Bernd and Hilla Becher, whose starting point is the visit they made together to Oberhausen, in the Ruhr area of Germany, in 1968. Robert Smithson and the Bechers are among the most significant names in the history of art of the second half of the twentieth century. Co-curated by James Lingwood, a longtime associate of the Bechers and organiser of the first major retrospective exhibition of Smithson’s work in Europe, this new exhibition presents selected works by Smithson and the Bechers from the brief period between the publication of Smithson’s seminal photo essay A Tour of The Monuments of Passaic in December 1967 and the publication of the Bechers’ first book, Anonyme Sculpturen, in 1970.