Krūminiai Hillfort is an impressive defensive site dating from the transition between the late 1st and early 2nd millennium AD, with the remains of an ancient settlement preserved at its foot.

The hillfort was already mentioned in 19th-century literature, where it was noted that local farmers frequently discovered archaeological artefacts on the banks of the Versekos River near the village of Krūminiai. Finds recovered here during the period of Polish administration are now preserved in the collections of the Lithuanian National Museum. These discoveries—including pottery sherds, spindle whorls and awls—provide valuable evidence of the lives of the people who once inhabited the area.

More recent archaeological investigations have identified an ancient settlement adjacent to the hillfort. Most of the artefacts date to the late 1st millennium and the early 2nd millennium AD. However, one remarkably well-preserved miniature cup and a straight-sided, tapering pot may date as early as the 4th–5th centuries AD.

The hillfort also offers beautiful views over the Verseka Reservoir and the surrounding landscape.