From Lee's list on everything you want to know on existentialism.
If aliens land and ask me what it’s like to be a human, I’ll give them Heidegger’s first book, Being and Time. Of course, that might prompt them to destroy all humans out of frustration at the difficulty of his writing, but if they persevere, they will find the best description of what it’s like to live out your time on this planet (One Hundred Years of Solitude comes in second).
Why should I read it?
What is this book about?
A knowledge of Heidegger's Sein und Zeit is essential for anyone who wishes to understand a great deal of recent continental work in theology as well as philosophy. Yet until this translation first appeared in 1962, this fundamental work of one of the most influential European thinkers of the century remained inaccessible to English readers. In fact the difficulty of Heidegger's thought was considered to be almost insuperable in the medium of a foreign language, especially English. That this view was unduly pessimistic is proved by the impressive work of John Macquarrie and Edward Robinson who have succeeded in clothing…