RTD, the regional public transit service, connects the airport to Union Station and other points downtown with the A Line^{[dead link]}, a relatively fast, efficient and reliable train. It runs every 15 minutes at peak times and every 30 minutes at off-peak (from approximately 4AM to 1:30AM), and it takes about half an hour to get to Union Station. It costs $10.50 to get downtown; this fare also includes a day pass for unlimited travel on local transit (including back to the airport if you are only going to Denver for the day). The train is cheaper than a taxi, and if you intend to use public transit during your stay anyway, the $10.50 day pass is a good value for your money and certainly a cheaper option than a rental car plus gas plus parking. The Denver area has expanded its public transit system, and it's starting to pay off.

For places not easily reached by the rail system, RTD's SkyRide^{[dead link]} coach service offers three bus routes that connect the airport to Boulder, Thornton, and the Denver Tech Center, serving many "Park and Ride" lots in the region. SkyRide coaches are equipped to handle luggage. Fare is the same as the train—$10.50 one-way, although the "Regional/Airport Day Pass" costs the same and covers unlimited trips on the RTD system for the remainder of the day.

The Transit Center is at the southern end of the terminal, beneath the Westin Hotel. A set of long escalators connect Level 5 of the terminal to the transit center. As you get to the bottom of the escalator, the train platform will be directly in front of you while the Skyride bus stop will be behind you. Ticket vending machines and transit info are available in the Transit Center; RTD's airport page^{[dead link]} offers more detailed information.

The major rental car agencies are represented at the airport. Counters are located on Level 5, in the middle of the main hall. The lots are along Peña Blvd west of the airport; courtesy shuttles to the lots pick up from Level 5 of the terminal.

Parking garages flank the terminal on both the west and east sides. The garages are connected to the building and cost $24/day or $3/hour; short-term parking is located with the part of the garage closest to the terminal and costs $4/hour. Economy lots are beyond the garages and cost $13/day or $3/hour. Valet parking is also available. For those waiting to pick up passengers, a free cell phone waiting lot is located at 7680 N. Wenatchee St., off Peña Blvd about three miles west of the airport. The cell phone waiting lot even has an indoor waiting area, with a couple of fast food restaurants, restrooms, free Wi-Fi, and flight information.

• There are several airline lounges located in the airport. American Airlines, British Airways, and Delta have lounges in Concourse A, at the north end of the pedestrian bridge. United Airlines has two lounges in Concourse B, one near Gate B30 and the other near Gate B44.
• USO Lounge, Concourse A, north end of pedestrian bridge, ☏ +1 303 342-6880. Daily 5AM-10PM. The USO has a center behind security for military personnel, with a television lounge, library, family services, food service and computers. (updated Mar 2017)
• A Massage, Concourse A center core and Concourse B mezzanine, ☏ +1 303 342-6889. Daily 7AM-9PM. Chair and table massage services. (updated Mar 2017)
• XpresSpa, Concourse C center core and near Gate C30, ☏ +1 303 342-6925. Daily 6AM-10PM. Personal care services including men’s and women’s facials, waxing, manicures, pedicures, hair styling/cuts and massages. (updated Mar 2017)

The airport is noted for its extensive and very eclectic art collection, with pieces ranging from delightful to strange to downright frightening. Jeppesen Terminal has most of the more notable (and notorious) works, which are spread throughout the terminal. Travelers arriving in the terminal via the train from the concourses are greeted by Experimental Aviation, a set of brightly colored paper airplanes suspended from the ceiling that lead arrivals from the train platform up into the main hall of the terminal. The expansive main hall is a sight in and of itself, allowing you to look up at the inside of the terminal's unusual roof. A statue of the terminal's namesake, early aviator Elrey Jeppesen, stands in the middle of the arrivals hall; there's also an exhibit on Jeppesen on the top floor at the north end of the terminal. Baggage Claims 3 and 16 are home to Notre Denver, a pair of bronze gargoyles perched within suitcases which watch over the floor. At the north end of the terminal, on the west side of the main hall, is an art gallery that hosts changing art exhibitions.

At the entrance to the airport, along Peña Blvd, stands what is perhaps Denver's most infamous artwork: Blue Mustang, a colossal 30-foot sculpture of a brightly-colored horse rearing up on its hind legs. The piece has a troubled history; during its creation, a portion of the sculpture collapsed and killed its creator, Luis Jiménez. Since its installation, the statue's fierce stance and glowing red eyes has led to locals dubbing it the "Devil Horse" and "Blucifer". Look for it as you drive towards the airport—it's hard to miss.

Past security, there's plenty more interesting artwork to look at while you're waiting for your flight. Both train tunnels hold more kinetic pieces: the outbound tunnel (leading away from the terminal) contains a series of propellers embedded in the wall which spin as the train rushes past; a Kinetic Air Light Curtain if you will. Going the other way, the inbound tunnel holds illuminated panels and animated sculptural forms in Deep Time / Deep Space, A Subterranean Journey. Train Call is a series of jingles of railroad standards that play before announcements are made on the train. The main atrium of each of the concourses hold monumental pieces that are worth viewing: Concourse A has Dual Meridian, a massive sculptural work of train tracks, a world map, and abstract Space Age forms towering over the train platform. Concourse B holds Beaded Circle Crossing, a four-legged archway at the center of the concourse that resembles a cross between a Native American tipi and the Eiffel Tower. The train platform at Concourse B has a statue of Jack Swigert, a Denver native who was an astronaut on board Apollo 13 and who successfully maneuvered the crippled ship back to Earth. Lastly, Concourse C has a terraced Garden overlooking the train platform, with ferns, stonework, and cast concrete panels that give the work the appearance of a ruined Mayan temple.

The airport's unusual architecture and artwork, coupled with its relatively isolated location and massive size, has spawned a series of bizarre conspiracy theories, with some people suggesting ties to everything from the Illuminati to the New World Order, while others have asserted that the true purpose of the airport is to serve as a concentration camp or a secret military base—or, alternatively, a sanctuary for elites following some sort of global disaster. Over the years, the conspiracy theories have taken on a life of their own, with some airport workers even taking part in pranks and planting further "evidence" of untoward goings-on at the airport. The airport itself has gotten to semi-jokingly asking the "question" what they are building when remodeling is going on, giving outrageous answer possibilities as well as the more banal "building new shops and amenities".

The main points of interest for conspiracy theorists are in Jeppesen Terminal, before security, so you'll have to set aside some time before your flight if you want to conduct your own search for the truth. Central to many of the theories is the Freemason symbol on a dedication plaque at the terminal's south entrance (near the Westin Hotel and RTD train station). The stone plaque, which contains a time capsule, is indeed stamped with a Freemason symbol as well as a reference to a now-defunct "New World Airport Commission"; which conspiracy theorists have pointed to as proof of a connection to the New World Order. Other symbols can be found stamped on the floor of the main hall, which were intended as references to Colorado's history and Native American heritage, though that hasn't stopped conspiracy theorists from taking away darker meanings.

The other focal point for conspiracy theorists are a pair of murals by Leo Tanguma, both on the main floor of the terminal tucked into a pair of hallways that connect the main hall to the baggage claim areas. One, In Peace and Harmony with Nature, depicts environmental destruction and the extinction of life, followed by a rebirth in which children and animals celebrate the planet's renewal. The other, Children of the World Dream of Peace, depicts the horrors of war before the children of the world usher in a new era of peace—pretty heavy subject matter for an airport piece. Additionally, some of the other artworks mentioned above, especially Blue Mustang and Notre Denver, have gotten wrapped up in all the conspiracy theories around the airport. Judge for yourself what it all means.

• Grill & Vine (Hotel & transit center, level 5), ☏ +1 303 317-1820. 6AM-11PM daily, bar 11AM-midnight daily. Bar & grill with an outdoor patio. 

• Elway's (Concourse B center), ☏ +1 303 342 7777. 7AM-11PM daily. A signature Denver steakhouse, offering steaks, rack of lamb, and burgers. Breakfast available, as is take-out. 

• Root Down (Concourse C center), ☏ +1 303 342 6959. 7AM-9PM daily. Excellent farm-to-table food such as sweet chili duck wings. Wide selection of craft beers and wonderful cocktails. Booths offer some nice seclusion, so you can focus on contemplating the decor made from vintage suitcases stuck to the wall, globes on the ceiling, and old airplane wings.