Martin Luther King Jr. Memorial
Photo: Martin Luther King, Jr Memorial in Washington, DC. (Photo via Evgeniia Ozerkina/iStock Editorial/Getty Images Plus)
This site has only been with us since 2011, but in a short time, it has become a must-visit in our nation's capital. The sprawling memorial is anchored by the Stone of Hope, which features a statue of Martin Luther King, Jr. carved out of granite.