Stretching westward for five miles from the Castillo de San Salvador de La Punta at the harbor entrance, the Malecón is a combination sea wall and promenade that was constructed in stages between 1901 and 1923. A place to stroll, jog, fish, swim, or just sit, it is a magnificent scene, especially when seas are high and the waves are crashing over the sea wall. There is a wonderful array of architecture, mostly dating from the late nineteenth and early twentieth century but punctuated with a few high-rises built before 1959. Many are in ruinous condition, with vacant lots where some have already collapsed. Poor or no maintenance for decades has left many, many buildings extremely vulnerable to the effects of tropical storms and hurricanes.