It's magical. And it's very loud. That moment when a helicopter lifts off is a sweet sensory overload, with turbine engines screaming and the main rotor beating the air into submission just a few feet above your head. But coddled in a good set of noise-canceling headphones or cocooned in a super-soundproofed cabin, you can experience the wonder of rotary-winged flight while marveling at the spectacular views unique to heli-sightseeing.