Casa Batlló and Casa Milà, Barcelona

Two of Gaudí's most famous buildings on the elegant Passeig de Gràcia. Casa Batlló has a rippling façade of coloured glass and bone-like balconies, and a roof shaped like a dragon's back. A few blocks up, Casa Milà, known as La Pedrera, 'the stone quarry', has an undulating stone façade and a rooftop of strange sculpted chimneys.

Both are open daily with timed tickets; La Pedrera also has evening visits. The Passeig de Gràcia is lined with other modernista buildings and luxury shops.