Well known Swiss sportscar tuning firm Rinspeed built an amphibious car in 2004. With complicated hydrofoil design, the vehicle can go with speed 31 mph (50 km/h) on water which is still pretty fast. Under 30 knots, the Rinspeed can cruise in water like a conventional boat. And on land it s even quicker, boasting a top speed of 124 mph (200 km/h). This amazing hydro car is powered by natural gas, and it s the first amphibious vehicle to be fueled by this environmentally friendly resource. It has a 750cc, two cylinder, turbo charged engine, and its integrated hydrofoil design can be deployed at water depths over four feet.