This document provides an overview of landmarks and neighborhoods in Barcelona, Spain. It describes the main squares, streets, cathedral, and neighborhoods that make up the city's historic center, including Catalonia Square, Les Rambles, the Gothic Quarter, and La Ribera neighborhood. It also highlights important landmarks such as Barcelona's cathedral, Santa Maria del Mar church, Arc de Triomf, and the still unfinished Sagrada Familia basilica designed by Antoni Gaudi.