We have entered into the age of the "megatall" skyscraper.

The first megatall tower - a building that soars over 2,000 feet into the air - opened ten years ago, according to Council on Tall Buildings and Urban Habitat (CTBUH). It was the Burj Khalifa, and it set astounding records at 2,722 feet tall or over half a mile high.

But come 2018, a new building will rise more than 550 feet taller than the Khalifa.

And the CTBUH predicts that buildings will just keep getting taller. There may even be a kilometer-tall building (that's 3,280 feet) by the end of the next decade.

We rounded up a list of some of the tallest buildings that are currently under construction, according to CTBUH. All of them will be finished by 2020, and four of them are more than 2,000 feet tall.

Needless to say, the skylines of the future will look a lot different.

10. Zhongguo Zun, Beijing, China

Height: 1,732 feet, Floors: 108

Completion: 2018

The name comes from the zun, an ancient Chinese wine vessel that inspired the building design. After completion, the so-called "China Zun" will be Northern China's second tallest building.

9. CTF Finance Center, Guangzhou, China

Height: 1,739 feet, Floors: 111

Completion: 2016

CTF Finance Center, is a mixed-use tower under construction in Guangzhou, China. The CTF building will have the fastest elevators in the world at 45 miles per hour. It will take take 43 seconds to go from the first to the 95th floor, according to the BBC.

8. Nordstrom Tower, New York, New York

Courtesy of New York YIMBY

Height: 1,775 feet, Floors: 92

Completion: 2018

225 West 57th Street is a residential project by Extell Development Company. The building will be the second tallest skyscraper in New York City as well as the US when it's finished.

7. Lotte World Tower, Seoul, South Korea

Courtesy of Kohn Pedersen Fox Associates

Height: 1,819 ft, Floors: 123

Completion: 2016

The Lotte World Tower is estimated to cost $1.25 billion, and will tower over the skyline of Seoul. The skyscraper took 13 years of planning and site preparation before it was approved in 2010 to begin construction.

6. Pearl of the North, Shenyang, China

Courtesy of Atkins

Height: 1,863 Feet, Floors: 113

Completion: 2018

The Pearl of the North will cost an estimated $1.6 billion and will be a mixed-used building in Shenyang, China. It will have 34 floors of offices as well as a 320-room five star luxury hotel, according to Architects Journal.

5. Goldin Finance 117, Tianjin, China

Courtesy of P&T Group

Height: 1,957 feet, Floors: 128

Completion: 2016

The Goldin Finance 117, also known as the China 117 Tower, is a skyscraper under construction in Tianjin, China. The building is estimated to cost over $820 million.

4. Wuhan Greenland Center, China

© Adrian Smith + Gordon Gill Architecture

Height: 2,087 ft, Floors: 125

Completion: 2017

Wuhan Greenland Center is a under construction in Wuhan, China. The building is expected to cost $4.5 billion.

3.Ping An Finance Centre, China

Courtesy of Kohn Pedersen Fox Associates

Height: 2,165 feet, Floors: 115

Completion: 2016

Ping An Finance Center is under construction in Shenzhen, China. The tower will cost an estimated $678 million and will be one of the tallest building in the world when finished in 2016.

2. Suzhou Zhongna Center, China

Height: 2,392 ft, Floors: 138

Completion: 2020

The Suzhous Zhongnan Center is a skyscraper under construction in Suzhou, Jiangsu. The project will cost an estimated $4.5 billion, and will be the 3rd tallest building in the world, as well as the tallest in China.

1. Kingdom Tower, Saudi Arabia

© Jeddah Economic Company/Adrian Smith + Gordon Gill Architecture

Height: 3,281 feet, Floors: 167

Completion: 2018

Expected to cost $1.2 billion to construct, Kingdom Tower will be a mixed-use building with a luxury hotel, office space, serviced apartments, luxury condos, and the world's highest observatory.

The Tower will be built in Jeddah, Saudi Arabia and will be over 550 feet taller than the United Arab Emirates' Burj Khalifa. The height of the Kingdom Tower will require the world's most sophisticated elevator system, and the building will have a total of 59 elevators.

When finished, it will become the tallest building in the world. (But who knows for how long.)