An obelisk is a tall, four-sided, narrow tapering monument that ends in a pyramid-like shape at the top. These structures were originally created by the ancient Egyptians and often made from a single piece of stone, known as a monolith. Obelisks were typically erected in pairs at the entrances of temples and were inscribed with hieroglyphs that celebrated the achievements of pharaohs or honored the gods. Today, many obelisks can be found around the world, including famous examples like the Washington Monument in the United States and the Cleopatra's Needle in New York City. They serve as historical landmarks and are often associated with themes of power and commemoration.