Malcolm Jameson 
Tarnished Utopia 
Time Travel Dystopian Classic

Allan Winchester, an American paratrooper, is taken prisoner during WW2. But Allan manages to escape to Munich where he meets an attractive German lady. Their fates intertwine when while fleeing from the Germans they take refuge in an abandoned cave and find themselves thousands of years in the future…
Malcolm Jameson (1891–1945) was an American Golden Age science fiction author whose writing career began when complications of throat cancer limited his activity as a naval officer. Drawing from his experiences of navy and warfare he gave a personal touch to all of his stories.