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14 (by volume): Hangar One

What is the world's largest building?

We chose two metrics -- footprint (by square feet) and usable volume (by liquid gallons) -- and are counting down the 27 largest in alternating order. 

Let's start with the 14th biggest building, based on usable volume.

Located at Moffett Federal Airfield near Mountain View, California, this massive structure was built in the 1930s as a naval hangar. Its volume: 264.2 million gallons.

In 2014, Planetary Ventures, a subsidiary of Google, agreed to pay $1.16 billion over 60 years to lease it.

Published:Caption:Photo:Mandel Ngan/Getty Images
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13 (by footprint): NASA Michoud Assembly Facility

1.9 million square feet

This NASA manufacturing complex in New Orleans has been used to construct equipment in World War II and the Korean War. 

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13 (volume): National Exhibition Centre, Halls 1-5

301.2 million gallons

Opened in February 1976, the first five halls of the Birmingham, West Midlands-based exhibition space host events such as the Crufts Dog Show.

Halls 6 through 20 are in a separate building. 

Published:Caption:Photo:Richard Stabler/Getty Images
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12 (footprint): Tesla Gigafactory 1

2.2 million square feet

Opened in July 2016, this Tesla factory in Storey County, Nevada makes the company's lithium-ion batteries. 

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12 (volume): Hannover Fairground, Halls 3–9

303.8 million gallons

The largest exhibition ground in the world, the Hannover Fairground in Niedersachsen was originally used to house aircrafts in the 1940s before turning into a permanent fairground.

Halls 1, 2, and 10 through 27 are in separate buildings. 

Published:Caption:Photo:David Hecker/Getty Images
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11 (footprint): New Century Global Center

2.15 million square feet

Located in Chengdu, China, this building features an IMAX theater, skating rink, pirate ship and a water park, among other attractions.

Published:Caption:Photo:Getty Images
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11 (volume): Austal USA Module Manufacturing Facility

360.6 million gallons

Housed on Blakeley Island in Mobile, Alabama, this facility can build up to six naval ships per year. The Australian company currently has contracts with the United States Navy. 

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10 (footprint): Belvidere Assembly Plant

2.3 million square feet

Open since 1965, this Chrysler factory in Belvidere, Illinois assembles the Jeep Cherokee.

Published:Caption:Photo:Mary Knox Merrill/Getty
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10 (volume): Target Import Warehouse

396.3 million gallons

Opened in 2007, this Savannah, Georgia warehouse handles merchandise for southeastern Target stores. 

Published:Caption:Photo:Google Earth
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9 (footprint): Indonesia Convention Exhibition

2.4 million square feet

The Indonesia Convention Exhibition is the biggest such center in the country. The venue has hosted Michael Bublé, Katy Perry and others since opening in 2015. 

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9 (volume): Tesco Ireland Distribution Centre

409.5 million gallons

Grocery store brand Tesco built this Irish facility in 2007 at a cost of more than $86 million.

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8 (footprint): John Deere North American Parts Distribution Center

2.6 million square feet

Built in 1973, the Milan, Illinois distribution center ships around 80,000 units per day, according to John Deere. 

Published:Caption:Photo:John Deere
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8 (volume): The O2

737.0 million gallons

Built within the former Millennium Dome, this colossal London entertainment venue has hosted the Olympic torch relay and the High School Musical 2 premiere. 

Published:Caption:Photo:Barcroft Media
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7 (footprint): Nike North America Logistics Center

2.8 million square feet

In 2015, Nike opened its largest distribution center, in Memphis, Tennessee. The facility houses the company's three major product lines: footwear, apparel and equipment. 

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7 (volume): NASA Vehicle Assembly Building

966.9 million gallons

Originally known as the Vertical Assembly Building, at NASA's Kennedy Space Center in Brevard County, Florida, was built to assemble and store vehicles such as the Saturn V and Space Shuttle.

Published:Caption:Photo:NASA/Getty Images
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6 (footprint): Great Mosque of Mecca

3.8 million square feet

The largest mosque on Earth, located in Saudi Arabia, surrounds the Kaaba, a holy structure at the center of the mosque.

Published:Caption:Photo:Bandar Aldandani/Getty Images
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6 (volume): Boeing Composite Wing Center

977.4 million gallons

On its Everett, Washington campus, Boeing invested more than $1 billion to open an assembly site for the wings of its largest commercial jetliner, 777X.

Published:Caption:Photo:Stephen Brashear/Getty Images
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5 (footprint): Michelin Distribution Center

4.0 million square feet

Announced in September 2016, the Michelin Distribution Center in Spartanburg, South Carolina, will be an automated tire warehouse for the Michelin, BFGoodrich and Uniroyal brands. It was in its second building phase of the project as of January 2018.

Published:Caption:Photo:Google Earth
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5 (volume): Meyer Werft Dockhalle 2

1.2 billion gallons

Located at the river Ems in Papenburg, Niedersachsen, this shipbuilding yard is home to one of the world's largest luxury cruise ship manufacturers.

Published:Caption:Photo:Handout/Getty Images
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4 (footprint): Boeing Everett Factory

4.3 million square feet

Built in 1967, this Everett, Washington Boeing factory was originally built to construct 747 airplanes. It now manufactures 767, 777 and 787 airplanes as well.

Published:Caption:Photo:Xinhua News Agency
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4 (volume): Aerium

1.4 billion gallons

Originally used as a hangar for the German airship Aerium in 1938, the Brandenburg facility is now known as the Tropical Island Resort, the world's largest indoor theme park.

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3 (footprint): Tesla Factory

4.6 million square feet

Located in Fremont, California, the Tesla Factory is the primary site for the company's car manufacturing. It was built in 2010.

Published:Caption:Photo:David Butow/Getty
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3 (volume): Jean-Luc Lagardère Plant

1.5 billion gallons

Located in Toulouse-Blagnac, France, the Jean-Luc Lagardère Plant is the assembly hall for the Airbus A380, the largest airplane in the world.

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2 (footprint): Mall of Dubai

5.4 million square feet

The largest mall in the world by total footprint is in the United Arab Emirates. Built in 2008, the massive center includes 1,200 shops.

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2 (volume): Great Mosque of Mecca

2.1 billion gallons

It should come as no surprise that this mosque appears on our list twice. I has a maximum capacity of 4 million people and remains open at all times.

Published:Caption:Photo:SOPA Images
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1 (footprint): Aalsmeer Flower Auction

5.6 million square feet

Located in Aalsmeer, Netherlands, this is the largest flower auction in the world. Nearly 20 million flowers are traded daily at the largest building in the world by footprint.

Published:Caption:Photo:Remko De Waal/Getty Images
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1 (volume): Boeing Everett Factory

3.5 billion gallons

On the Boeing campus in Everett, Washington, this enormous factory -- the same building with the fourth-largest footprint -- manufactures the Boeing airplanes. Based on volume, it's the largest building in the world.

Published:Caption:Photo:Stephen Brashear/Getty Images
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