Las Vegas' dystopia-sphere, powered by 150 Nvidia GPUs and drawing up to 28,000,000 watts, is both a testament to the hubris of humanity and an admittedly impressive technical feat | PC Gamer
Before the Sphere, the largest spherical building in the world (since 1989) was the Globe in Stockholm.
On it they sometimes project stuff on, which seems to be a way cheaper and energy efficient way than adding a billion LEDs.
Fun fact about the arena Globen, it's actually the biggest piece in a art installation about our solar system, representing the sun. Pluto is about halfway up in Sweden.
It's also the home arena of Swedens national ice hockey team.