A plane flying upside down makes this 1930 Papua stamp one of the greatest ever Australian issues. Read about its sale here.

We can all spot a Lowry today, but in 1925 this picture was bought for £10. Read about its upcoming auction for £1 million.

Another big Honus Wagner T206 baseball card sale sees the big man go for short of $2 million. Discover this legendary card ...

Lowry’s work today is really well known, but he was an unknown when he sold this picture for £10 and threw in another work for free. Now just one will sell for £1 million.