Today marks the 20th anniversary of the Indian Ocean tsunami, which took the lives of more than 220,000 people. In the hardest-hit province of Aceh, Indonesia, $1.6 billion in international aid was used to build 140,000 homes for survivors. But two decades out, many of these houses have been abandoned. With support from the Pulitzer Center, Leila Goldstein traveled to Lampuuk Beach, outside of the city of Banda Aceh to understand why.