http://aaj.tv/2016/11/ten-most-amazing-caves-in-the-world/

Depends on your definition of 'cave' and amazing I suppose....however does show underground spaces are varied.

A quick comment on Reed Flute Cave - the reeds grew (grow?) outside the cave, not inside it.  And the beautiful colours are due to coloured floodlights.  But still impressive.

The Cave of the Swallows is also fairly impressive - if it really has a straight drop of 333m it makes Alum look a bit average!

Cave of the swallows is more commonly known as Golondrinas.  See the photos of Amy's visit;

http://ukcaving.com/board/index.php?topic=14654.0

Awesome place but there are so many others in the world too.  An impossible list to compile.

Fun fact: Cave of the Swallows (Golondrinas) photo they used is certainky not Golondrinas and looks amazingly like Neversink which is 45 minutes from me.

Second fun fact: Ellison's Cave (not caves, there is only one) has Fantastic Pit inside of it which yes is 586ft freehang but the entire cave itself is much deeper. Fantastic basically gets you to "mid level" it goes deeper. Here it is in high water. When i went was about as wet as was safe for this side. Other entrance has Incredible pit (over 400ft) but a narrower drop that you cannot rig out of the waterfall - when i went Incredible was basically "sumped".
https://flic.kr/p/rtyWKa

That's a cracking photo Amy!