The line's three new Edge Class ships are widely heralded as three of the most innovative cruise ships at sea. They offer such groundbreaking features as cabins with glass walls facing the sea that open at the top to create a balcony-like feel and "Magic Carpet" platforms on their exteriors that move up and down for a variety of uses.

The Edge Class ships are just the latest vessels at the line to break ground when it comes to innovation.

The line's somewhat older Solstice Class ships also offer a number of features that were groundbreaking in their time and — in many cases — remain rare and alluring more than a decade after they first debuted.