The Red Pyramid at Dahshur

The Red Pyramid, located at the Dahshur necropolis in Cairo, Egypt, is the third largest Egyptian pyramid after those of Khufu and Khafre at Giza. It is believed to be Egypt's first successful attempt at constructing a "true" smooth-sided pyramid. The Red Pyramid was built by Old Kingdom Pharaoh Sneferu around 2575-2563 BCE. With a height of 105 metres, this remarkable structure stands one kilometre to the north of the Bent Pyramid. Local residents refer to it as el-heram el-watwaat, meaning the Bat Pyramid.

Tourists can climb steps to an entrance on the north side of the pyramid and explore the passages that slope down at a 27-degree angle for 200 feet. The first two chambers have their long axis aligned north-south, while the third chamber has a rough and sunk floor believed to be the work of tomb robbers. The third chamber also has a ceiling and walls blackened with soot, leading many to speculate it as the burial chamber.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons