Transportation has evolved significantly since ancient times. Early humans relied on walking but then began using horses and horse-drawn carriages. Water transportation developed through sailing ships and steamboats. Rail transportation emerged through early trains powered by animals and steam engines. Cars were invented in the late 19th century, powered initially by gasoline engines. Airplanes were developed in the early 20th century through the Wright brothers' pioneering controlled flights. Modern transportation also includes motorbikes, trains, and spacecraft.