When the iconic Lincoln Memorial in Washington D.C. was built in the 1910s and 1920s before opening officially in 1922, giant pillars were placed under the main structure to mitigate the swampy terrain. And from that time, the space between those pillars was mostly empty. Until now. In June 2026, the Lincoln Memorial Undercroft Museum opened to the public, and in July 2026 I was able to visit with my family, including my 4 kids. Based on lots of research online and my personal experience visiting with my family, here's what I think families should know about visiting this cool new museum: Where is the Lincoln Memorial Undercroft Museum? The Lincoln Memorial Undercroft Museum is located under the Lincoln Memorial, which sits on the National Mall at 2 Lincoln Memorial Circle NW in Washington DC. The entrance to the undercroft museum specifically is to the right of the stairs if you are looking at Abraham Lincoln with the reflecting pool to your back, through the sam...