While new optical illusions go viral all the time, here are some of the most famous illusions that have kept us scratching our heads for years.

Optical illusions often go viral, but they've been around long before social media. Here are 10 historical illusions that ...

Optical illusions are older than you think. The first optical illusions date back to 20,000 BC and were seen in caves. Nowadays they are found all over the place – on screens, in books and even in ...

All over the world, there are naturally occurring optical illusions that captivate spectators. Cloud formations can sometimes make it seem like there's an ocean or a UFO in the sky. Whether it is salt ...

If you haven’t made your way up to The Peak for a while now, there will soon be a fantastic reason to do so: the Museum of Illusions is opening in Hong Kong. This brand-new entertainment destination ...

The optical illusion below is more than it appears at first glance. Even after three or four glances, you may be struggling to wrap your head around it. That’s because it’s impossible to view all nine ...

In the first century B.C.E., Vitruvius wrote that the Acropolis’ largest temple was horizontally bowed so that it didn't seem to sag, and that explanation persisted for millennia. New research suggest ...

The argument can be traced back to the Roman author Vitruvius, who talked about Greek architecture several centuries after the Parthenon was finished. Vitruvius said that if the platform was ...