Thousands of people believe the Earth is flat and could have a dome

Then by around the 14th century most educated scholars agreed with the viewpoint of the Ancient Greeks that it was, in fact a sphere.

But now, amazingly, thousands of people are reverting back to the age-old theory the globe is more a diorama - with a hardcore among them adding the cherry on top that it is capped off with a glass dome, that prevents us from leaving.

And it is not just YouTube video makers in their bedrooms putting together short films touting the theory.

A series of, in some cases, slick websites trying to convince the world things are much flatter have sprung up.

Most agree the world is not a spherical planet in space, but, instead a disc or plain, but then the theories differ in craziness.

One of the slickest-looking websites is enclosed world.com.

It purports the conspiracy that the disc-like Earth is enclosed in a giant Centre Parks like dome.

It brings together a series of YouTube videos called Flat Earth Clues which started being posted online this year.

In short, the website claims the "flat Earth" is protected by a giant glass dome, the surface of which is higher than any plane can fly..and makes clear this is "NO joke".