Yokoi Shoichi's cave
Yokoi Shoichi, Japanese soldier, hid out on Guam during World War II. He lived in this cave in the ground for 28 years, because he didn't know the war had ended. The hunter who discovered him in 1972 told him the war ended. "It is with much embarrassment that I have returned alive," he is quoted upon his return to civilization.
This photo is on the Wikipedia page for Yokoi Shoichi.