First as a side-note, Mark Twain's Roughing It is like a wonderfully vivid travelouge.
I also highly highly reccomend Godel, Escher, Bach by Douglas Hoffstander, a true wonder to read.
Since mayneverhave and stlukesguild stole all of my reccomendations I'll just reccomend philosophy (which will probably be useless for you unless you are particuarly interested, but I'm really bored):
Any of the works of the pre-Socratics
Apology - Plato
[I]The Republic[I] - Plato
Metaphysics - Aristotle
Nichomachean Ethics - Aristotle
Discourse on the Method - Rene Descartes
Pensees - Blasie Pascal
Treatise Concerning the Principles of Human Knowledge
An Enquiry Concerning Human Understanding - David Hume
Critique of Pure Reason - Immanuel Kant
Phenomenology of Spirit - Georg Wilhem Friedrich Hegel
Fear and Trembling - Soren Kierkigaard
The Gay Science - Friedrich Nietzsche
The Will to Believe - William James
Philosophy of Arithmetic - Edmund Hurrsell
Being and Time - Martin Heidigger
All Things are Possible - Lev Shestov
Being and Nothingness - Jean-Paul Sartre
The Myth of Syphisus - Albert Camus
Philosophical Investigations - Ludwig Wittgenstein
Of Grammatology - Jaques Derrida
The Postmodern Condition - Jean-Francis Lyotard
History of Madness - Michael Foucault
Simulacra and Simulation - Jean Baudrillard
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