The biggest dinosaur footprints ever discovered were found in northwestern Australia. Thousands of tracks belonging to 21 different types of dinosaurs were found on a 25-kilometre stretch of the coastline. The area is being called “Australia’s Jurassic Park”. The largest footprint is nearly 5 feet 9 inches (1.75 meters) long. The tracks are estimated to be between 127 to 140 million years old. Here is a video about it.