Lighthouse Bagging is becoming very popular...

This is where people visit all the lighthouses they can - It's a hobby of Princess Anne and is properly called pharology.

The term pharology - the study of signal lights and lighthouses - comes from Pharos, the huge lighthouse of Alexandria that was built in the third century BC and for centuries was one of the tallest man-made structures on earth.

It even made a story on the news!

So how many Lighthouses can you "bag"?