Take a ride on the, most likely, world's steepest zip-line. The Flying Dutchman, on Sint Maarten's Rockland Estate (Netherlands Antilles), is the world's steepest zip-line. It has over 2,800 feet of cable, and a vertical drop of 1,050 feet. Riders can reach speeds over 56 mph. From the top, riders are treated to a stunning view of the island's landscape. It's a quick ride down, however, so don't blink! And take for granted that you won't breath either!