I know it's sometimes a dodgy subject, but how about Religion?  It's one thing that no matter where in the world it is it gets a lot of time and money spent on it, and consequently has beautiful things to photograph. (I would have suggested Politics, but that can be included when someone suggests 'clowns' or 'circus' lol)

I'd also like to suggest 'Airborne' and 'Water Lover'. To hell with it, 'Earth' and 'Wind' too. lol.

(",)

oops, sorry Pushy, I failed to spot your earlier 'water' one.  I second it then. lol.

When you starve with a tiger, the tiger starves last.