What is Ellis Island made of?

Ellis Island is primarily made of granite, a durable rock that was used extensively in its construction. The island was originally a natural landform, but significant expansion took place using landfill materials, including soil and debris from New York City construction projects. The main building, the Ellis Island Immigration Station, was built using red brick and terra cotta, giving it a distinctive architectural style. Today, it serves as a symbol of the immigrant experience in the United States.