Religion:
The Story of a Soul - St. Therese of Lisieux
The Seven Storey Mountain - Thomas Merton
The Catechism of the Catholic Church
Literature:
Out of Africa - Isak Dienesen
Ruslan and Ludmilla - Alexander Puskin
Pushkin Threefold - Walter Arndt (translator) - includes much of Pushkin's verse both in the original Russian and w/English translation on the facing page
Doctor Zhivago - Boris Pasternak
Of Human Bondage - W. Somerset Maugham (I also love many of his short stories - especially those about the South Seas)
Women's Independent Travel:
A Journey of One's Own - Thalia Zepatos
Kite Strings of the Southern Cross - Laurie Gough
Adventure Travel:
The World's Most Dangerous Places (all editions) - Robert Young Pelton
Autobiography:
My Wicked, Wicked Ways - Errol Flynn (who was a surprisingly entertaining storyteller as well as a world adventurer even before his Hollywood days - the guy led a fascinating life, with or without movie stardom)
War, World Poverty & Other Moral Issues:
A Rumor of War - Philip Caputo (Vietnam War)
Nam: The Vietnam War in the Words of the Men and Women Who Fought There - Mark Baker (self-explanatory)
Hiroshima - John Hersey (the personal stories of several survivors)
Night - Elle Wiesel (The Holocaust & WW II Concentration Camps)
Actual Innocence - Barry Scheck, Peter Neufeld, Jim Dwyer (wrongful criminal conviction and The Innocence Project)
Material World - Peter Menzel
History:
The Last Tsar - Edvard Radzinsky (who actually wrote a few interesting, accessible, and surprisingly entertaining volumes on Russian History - specifically about Tsar Nicholas & family, Rasputin, etc. Those wacky Romanovs!)
A History of Russia - Nicholas V. Riasanovsky (also a very readable volume, though not as entertaining

)
Twelve Who Ruled - RR Palmer (about Robespierre and the rest of the members of the Committee of Public Safety - French Revolution. Probably the most interesting book I read in college)
Evita: An Intimate Portrait of Eva Peron - Tomas de Elia & Juan Pablo Queirez (this is actually a coffee table book filled with photos, but I believe that once you know the basic story of Juan and Eva Peron, books full of photos like these
really tell the story. And Eva's is a fascinating story that continued well after her death.)
Favorite Books as a Child:
The Little House in the Big Woods (really, the entire series) - Laura Ingalls Wilder