We provide a tour of Barcelona, Catalonia, Spain, following four routes through the city and one elsewhere in the city and beyond, focusing on sites of importance in physics. Route 1 covers the Old Town, its Gothic Quarter, Plac ̧a del Rei , Plac ̧a de Sant Jaume , and Jewish Quarter. Route 2 identifies sites on and close to La Rambla , the main promenade in the city. Route 3 goes from the medieval shipyards to the Board of Commerce to Citadel Park. Route 4 con- centrates on the Extension ( Eixample ) and covers the restored University, the Industrial University, and the new campus of the University of Barcelona. Elsewhere in the city and beyond are the Fabra Observatory; the Plac ̧a de les Glo ` ries with its large steel sculpture depicting the meridian arc from Dunkirk to Barcelona; Montjuı ̈ c, the site of the National Art Museum of Catalonia; and the National Museum of Science and Technology in Terrassa