I think water is incredible for about a billions reasons. We have life timing in the the oceans, vegetation brought forth but simple rain and a zillion other things. Some of these is easier to see then others.
The Grand Canyon was made by a great river which cut into the earth and thousands of years later we can see the result.
A team of archaeologists recently found the biggest cave in Britain (see here). I think cave systems are fascinating and at times regret sticking with academic history rather then going into archeology. The most incredible cave system I've ever seen in real life was in a Spanish town called Nerja (Nerja Caves).
I don't think pictures can really do places like this justice, to think something so simple as water has given the world so much. I don't mean just caves, you couldn't have life on earth without water (including us). Water shapes our world and defines it.
On the Cave note, another amazing cave system, this time thanks to gypsum and lemon-yellow sulfur brought to my attention cos of David Attenborough's series 'Planet Earth' is the Lechuguilla Caves In New Mexico (USA).
These are so beautiful, they are beyond any work of art I've ever seen. Our world is full of wondrous things, isn't it time we took care of it?
"A Waterfall begins with just a few drops of water and look what comes from that" - Bryce Courtney