Several, I would say. Gerald Durrells series of stories documenting his travels and collection of animals inspired in me an abiding interest in the natural world and travelling.
I have always been an avid Sci-Fi reader, and works by greats like Asimov and later people like Iain Banks have sparked and fuelled an interest in all elements of science, along with books by people like Sagan (Cosmos, Daemon Haunted World)
Robert Trestles Ragged Trousered Philanthropists was a learning experience, too.
The Unbearable Lightness of Being was an education; as was VS Naipuls In a Free State.