Archaeology is the study of human culture through the examination of physical objects. These items may be anything humans created or used in the past. The materials archaeologists study fall into two categories: features and artefacts. Some well-known features include the Egyptian pyramids, the ancient Incan city of Machu Picchu in Peru and the sunken ship Titanic. Movable objects like tools, human bones, handcrafts and clothing are examples of artefacts. Archaeologists might study a New York building constructed in the 1920s, or they might examine camp bedding left in a South African cave more than two hundred thousand years ago. Archaeologists hope objects like these will provide clues about past human cultures.