Marina Bay Sands SingaporeMarina Bay Sands hotel is seen at sunset on June 11, 2018 in Singapore.Chris McGrath/Getty Images

Skyscrapers have gotten taller, more expensive, and a lot more elaborate over the past few decades.

Some of the most recent designs incorporate wild twists, thousands of plants, and even unattainable features like the ability to hang off an asteroid.

Business Insider has rounded up 20 of the most outrageous-looking towers; some have been in use for years, while others will likely never see the light of day. Take a look below.