Between schooling hammerheads, majestic mantas and a kaleidoscope of colorful corals, among others, these underwater spots are not to be missed.

Dragon Dive Resort is a PADI Five Star IDC resort in Komodo, Indonesia, that offers scuba divers quality, safety, small groups, big wildlife, and both land-based and liveaboard stays.

Open-water certification is great, but the destinations on our list are best visited after mastering some advanced training. Here are six sites where extra certification goes a long way.