From giant offshore oil rigs to massive tunnel digging drills, here are eight of the biggest machines in the world!

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8. Boeing 747
One of the most recognizable jetliners in the world, the Boeing 747 made its first flight in February 1969. Quickly becoming a favorite of passengers, it was also used as the airliner for Air Force One as well as being the setting for a number of Hollywood adventure movies.

7. Prelude Ship
The Prelude is a floating liquefied natural gas facility off the coast of Australia that produces natural gas for cargo customers in Asia. Stretching almost 1/3 of a mile (0.8km) long with the deck longer than four soccer fields, the Prelude displaces as much water as five aircraft carriers.

6. Space Shuttle
With big dreams come big ships, so it's no surprise that NASA's space shuttle, the world's first reusable spacecraft, is one of the largest machines that currently exists. The very first space shuttle mission was launched in April 1981 aboard the orbiter Columbia. The last was Atlantis, which flew in July 2011. But the space shuttle program also suffered two major disasters, including the Challenger in 1986 and the Columbia in 2003, upon which 14 astronauts died while flying the two missions.

5. Hydraulic Forging Press
During the 1930s and 1940s when Germany was building their arsenal for war, they ran out of steel. But with their mines producing large quantities of magnesium, German scientists came up with a way to build their armament.

4. Large Hadron Collider
Near Geneva, Switzerland, the most powerful particle accelerator ever built sits in a tunnel 320 feet (100 m) underground. A machine that pushes protons or ions to near the speed of light, the Large Hadron Collider accelerates beams of particles to such incredible speeds that they move almost at the speed of light itself.

3. Dredges
While dredges were used by old-timers when excavating gold in Alaska, a much larger dredger known as the Cristobal Colon Ship tips the scales. A one-of-a-kind dredging ship, it measures 750 feet ( 223 m) lengthwise and 1230 feet (41 m) breadth wise.

2. Big Bertha
When the Washington State Department of Transportation needed to build a new tunnel after the collapse of the Alaskan Way Viaduct, they needed a method that would not displace or destroy the city’s skyscrapers and historical buildings above ground. To accomplish that, they commissioned a Japanese firm to build a 57 1/2 foot diameter (17m) 326 foot long (100m) worm dubbed Big Bertha to dig the tunnel.

1. Komatsu D575A Bulldozer
Big jobs require big machines so it's no surprise that the largest production bulldozer in the world is used in massive open mines to move material. Able to push 3375 cubic feet (95m³) of dirt, the Komatsu D575a-3 super dozer weighs 336,000 pounds (150,000kg) and has 1100 horsepower. Because it is so big, the dozer must be disassembled and moved in 6 to 8 tractor trailer-loads.

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