Frank Lloyd Wright was a pioneering American architect known for his innovative designs and philosophy of organic architecture, which emphasizes harmony between human habitation and the natural world. His most famous works include Fallingwater, a house built over a waterfall, and the Guggenheim Museum in New York City, which features a unique spiral design. Wright's approach to architecture was revolutionary, focusing on open spaces and natural materials. He believed that buildings should blend seamlessly with their surroundings, a concept that has influenced countless architects and designers. His legacy continues to inspire modern architecture today.