Super-luxury estates don't just come with swimming pools and tennis courts these days, but also boast elaborate home theaters and special controls that can unlock doors or adjust thermostats even if you're halfway around the world.
"I'll walk into a dark house with a buyer, press one button and turn on the lights, the music and the home theater downstairs," says Debra Johnston, an Atlanta real estate agent who specializes in high-end properties. "The whole house is ready to go -- and the client can see that."
More and more high-end properties feature such "smart-home" technologies - professional-grade audio/video systems, plus lights, thermostats, window shades and more that you can control with an Apple iPad or other smart device.
Read on for five of the poshest smart homes.