While I have to research some countries for a while to discover what I want to write about them, a few are no-brainers. New Zealand is one of the latter countries for me. Why? Haka.
I had several Polynesian friends growing up and a Samoan roommate in college so I attended a lot of Polynesian dance rehearsals and helped out with luaus. There are many fun dances from the various islands, but haka is something else entirely. Get guys in native dress with their faces painted doing this within a few feet of you and yes, even when you know what is coming, it can be intimidating. Rugby players are well aware of this because of the haka tradition of the All Blacks Rugby Team:
The guys I watched performing haka in person never did it halfway- they left handprints on their chests from slapping themselves so hard. These 6th,7th, and 8th year boys clearly demonstrate the intensity I'm talking about, especially about 3 minutes into the video:
There are several reasons I enjoy haka. One is there is a unity and an individuality to each one that is powerful. Haka aren't just war dances and they aren't just performed by men; they are used for many reasons and occasions. One chant I was taught in college is actually used to welcome people. I've not found a good video that matches my personal experience of it but an audio file and description of what is now commonly known as a haka pōwhiri can be found here.
And here's a haka that is just for fun: