CA, US & World
New $69 Million 'Undercroft' Museum Unveiled Beneath the Lincoln Memorial
The Lincoln Memorial stands as one of the most visited and universally recognized monuments in the United States. However, a massive new subterranean project is preparing to show the public a completely hidden side of the historic structure, revealing a spectacular labyrinth of engineering that has remained obscured in the dark for over a century.
A highly anticipated 15,000-square-foot museum space called the Undercroft has officially been completed under the monument's main floor. The new exhibit area gives visitors a direct look at the massive, cavernous concrete foundations and soaring architecture that securely anchor the monument to the nation's 16th president.
Building a "Cathedral" in the Swamp
While modern visitors walking up the marble steps of the memorial might assume the structure sits naturally atop a high hill, the geography tells a very different story. The National Mall was originally built on heavily reclaimed, marshy wetlands.
To support the immense weight of the marble monument, early 20th-century engineers had to dig deep into the bedrock, constructing an underground network of 122 massive, vaulted concrete columns. US Secretary of the Interior Doug Burgum highlighted the awe-inspiring nature of the newly accessible historical space during an advance preview.
"The tens of millions, hundreds of millions of people that have visited the Lincoln Memorial, probably think that this beautiful memorial is placed on a hill, but of course this was all a swamp—this was reclaimed land," Burgum explained. "As you walk in here, you'll understand that the Lincoln Memorial is essentially built on the roof of a cathedral, and that cathedral underneath is 122 arched columns."
The new museum space will utilize these subterranean arches as a dramatic backdrop for educational displays, interactive exhibits, and media presentations. Visitors will be guided through the complex history of the memorial, the symbolism of its design, and the stories of the specialized craftsmen and laborers who built it.
A Decade of Construction and Philanthropy
The sweeping construction project has been actively in the works for the last decade, requiring delicate excavation and structural reinforcement to ensure the integrity of the monument above remained perfectly undisturbed. The total cost of the ambitious engineering endeavor reached approximately $69 million.
The vast majority of the funding—a foundational $50 million investment—was provided to the National Park Foundation by billionaire businessman and prominent historic philanthropist David Rubenstein.
"The reason this is the most popular site in Washington is because people recognize that Lincoln was an extraordinary person of great humility and great talent," Rubenstein stated. "And so as people come here to see the undercroft and to see the Lincoln Memorial, I hope all of them learn more about Lincoln—and that's the whole purpose of the undercroft."
Visitor Information
The federal project is preparing to welcome travelers just in time for the busy summer season. While entry into the Undercroft museum is entirely free to the public, the National Park Service will require all visitors to secure a timed-entry ticket in advance online due to strict capacity limits within the historic underground space.
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By: NBC Palm Springs
June 25, 2026
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