The Washington Monument is one of the most recognizable monuments in Washington D.C.. It took over 50 years to build, and it has stood for over 100 years. How much do you know about this magnificent monument. How thick are the walls at the base of the monument? Why is the Washington Monument made up of two different colors of marble? Why is there a stone in the monument that says “My language, my land, my nation of Wales – Wales forever”? What metal was used to cap the Washington Monument? Find out more about the Washington Monument and amaze your family and friends with these fun facts. All measurements in American and metric. The Educational Version has activities that meet Common Core Curriculum Standards. LearningIsland.com believes in the value of children practicing reading for 15 minutes every day. Our 15-Minute Books give children lots of fun, exciting choices to read, from classic stories, to mysteries, to books of knowledge. Many books are appropriate for hi-lo readers. Open the world of reading to a child by having them read for 15 minutes a day.