Why is it so important for us to scratch those I was here messages?

Welcome to the internet.

I have never really been inside a cave, which is weird I think :D

If I remember correctly, there is a famous house with cats (not roosters) in Riga but I do remember seeing the roosters on the spires. Is the devil scared of the rooster's crow because it signals sunrise and the end of the darkness?

That familiar looking mud dog looks like she had a a grand old time in the sand.