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The Undercroft beneath the Lincoln Memorial and it’s a fascinating story that’s suddenly in the news because the public can finally see it. The Lincoln Memorial sits on what used to be swampy, marshy land (the Potomac Flats) that was reclaimed from the river through dredging and filling. When construction started in 1914, engineers knew the soft soil couldn’t support the massive marble structure and the huge statue of Lincoln without it sinking. Their solution was to excavate down roughly 40–50 feet and install about 120–122 massive concrete pillars (sometimes called piers or piles). These were driven all the way down to solid bedrock. The pillars support the entire weight of the memorial above. The huge open space they created underneath, a cavernous, roughly 50,000-square-foot structural chamber (nearly twice the size of the memorial itself) is called the Undercroft. For over 100 years this space stayed hidden from the public. It was basically a giant concrete forest of towering pillars holding everything up, with some original construction graffiti still visible on them and even stalactites from water seeping through over time. The National Park Service has turned part of it (about 15,000 square feet) into a new museum and exhibit space. You can now walk in and see the actual massive concrete supports that were put in because of the swampy ground, along with interactive exhibits about the engineering challenges, the memorial’s construction, and its powerful role in American history (including civil rights moments like Marian Anderson’s concert and MLK’s “I Have a Dream” speech). It officially opens to the public on June 25, 2026, with timed-entry tickets required (free admission, small service fee for advance reservations). It’s already getting a lot of attention in the media as one of Washington’s “best-kept secrets” finally revealed.

Patricia 🇺🇸

227,705 views • 6 days ago