1) The novel "To Kill a Mockingbird" by Harper Lee has been translated into more than 40 languages and has sold over 40 million copies worldwide.

2) The United Nations (UN) is an international organization founded in 1945 with the goal of promoting peace, security, and cooperation among nations through diplomatic and political means.

3) The word "guitar" contains three vowels: U, A, and I.

4) The Giza Pyramid Complex, situated on the outskirts of Cairo, Egypt, is home to the iconic Great Pyramid of Giza, one of the Seven Wonders of the Ancient World. It was built as a tomb for the pharaohs and represents the pinnacle of ancient Egyptian architecture and engineering.