On this day, ten years ago, a magnitude 9.1 earthquake struck beneath the Indian Ocean near Indonesia, generating a massive tsunami that claimed more than 230,000 lives in fourteen different countries, one of the deadliest natural disasters ever recorded. Today, many of the communities have recovered, though painful memories and some ruined structures remain in place. Across Asia today, memorials were held in remembrance of the thousands of victims. Amid the commemorations, continued warnings from earthquake experts that early-warning systems need even more development and funding in the region. Gathered here are images of the 2004 event, a series of then-and-now comparison images, and photos from today's memorials.