The Danish archaeological site linked with Beowulf’s Heorot is Lejre.
Lejre, on the island of Zealand near Roskilde, was an important center in Danish legend and tradition. Medieval writers associated it with the Skjöldung dynasty, the legendary royal family corresponding to the Scyldings of Beowulf. That connection made Lejre a strong candidate for the historical setting behind Hrothgar’s magnificent hall.
Archaeological excavations at Lejre uncovered a sequence of very large halls. One hall was built in the mid-6th century, while later structures were constructed over or near earlier buildings. The excavated halls were roughly 50 meters long, making them plausible counterparts to the poem’s image of a powerful royal mead hall. Work at the site took place in campaigns including 1986–1988 and 2004–2005.
Lejre is best understood as a proposed historical inspiration, not a proven identification. Heorot is a literary hall, and the poem never names Lejre. The site is also near Roskilde, but Roskilde is the regional reference point rather than the archaeological answer.