At the base of the city wall at the southwest corner of Old San Juan is a delightful promenade called Paseo de la Princesa. The short, tree-lined esplanade ends at the Bay of San Juan. Along the way you will encounter artisan stalls and street vendors. On weekends and holidays, the lively ambiance is filled with music and street food. Princess Walk was created in 1853. At the start is this section of wall known as the Bastion of the Right of San Justo and Pastor. It was named after a medieval basilica in Barcelona. This fortification served as a critical defense along the waterfront. The sentry box dates from the late 18th century.