The Rocky Mountains stretch 3,000 miles from Alaska to New Mexico, are the largest mountain range in the US, and are a relatively young range at only 80 million years old. Activities include skiing, snowboarding, and hiking. The World Trade Center in New York was the site of one of the worst terrorist attacks in history on September 11, 2001, and the US has been engaged in ongoing wars against terrorism since then in Iraq and Afghanistan. The conflict between Israel and Palestine continues as Israel has increasingly taken land originally belonging to the Palestinians after the creation of Israel following World War 2.