USAirport Parking, Commerce City

53,275,923 people. That's how many passengers used Denver International Airport over the course of 12 months ending with January 2013, good enough for 13th place on the list of the busiest airports in the world. Given DIA's relatively removed location, lack of public transportation options, and all the legal red tape involved with growing wings, all those passengers mean one thing: cars.

USAirport Parking is up to the challenge of keeping those cars safe and their owners at ease. Located a 10-minute shuttle ride from the airport terminal, the lot can be hard to fathom by numbers alone: 60 acres of fenced-in pavement, 1,200 covered spaces, and a maximum capacity of 8,000 vehicles. For car owners, it's a simple process: simply park the vehicle in an empty space, and then catch the airport shuttle that runs every 7 to 10 minutes between 7 a.m. and midnight—and by request at any other time. An attentive and friendly staff keeps watch at all times. Where the power of human observation ends, a 24-hour camera system fills in to catch any foul play or UFO landings.