Google traveling through rural Lithuania

What looks like two ammunition bunkers beside a highway wide enough for a transport aircraft to land. Years have given natural camouflage to the bunkers.

https://www.google.com/maps/@55.8979004,23.3716257,3a,75y,269.52h,87.26t/data=!3m6!1e1!3m4!1sxK6l5pqTxqVOJhgqDiQkAQ!2e0!7i13312!8i6656

A nearby airport is labeled “Siauliy Oro Uostus.”