Air travel continues to grow, with more and more of us flying every year. Despite the popularity, it can be expensive, especially with the nickel-and-diming airlines now do, from checking your luggage to picking choice seats. But one amenity that’s worth splurging for is access to airport lounges. Think about it: Major airports are increasingly becoming crowded, making it hard to find a place to sit, let alone a power outlet. Food options are also scarce and subpar. And unforeseen disruptions can cause longer-than-expected wait times. Suddenly, that $50 entry fee for a quieter space sounds like a great investment. Forget about the elitism that some have of lounges – no, you’re not better than the hoi polloi – but see them as a space to work, grab a meal, or have some fun for a few hours before a flight or during transit.

“Airport lounges have this stigma, for the select few elite,” says Tyler Dikman, CEO of LoungeBuddy, which makes an app to help you find lounges and gain access. “In reality, it’s one of the least expensive luxuries.

1. American Express Centurion Lounge, DFW Complimentary cocktails with celebrity chef-prepared Tex-Mex buffet; gratis spa treatments; luxurious shower rooms. (Other locations include Las Vegas, San Francisco, and New York LaGuardia)

2. Delta Air Lines’ Delta Sky Club, ATL “The Sky Deck” – an outdoor terrace offering runway views; shower suites available; complimentary house beer and wine.

3. Airspace Lounge, SAN Luxurious shower facilities; floor-to-ceiling windows with unobstructed views of the tarmac; customized selection of music.

4. Star Alliance Lounge, LAX Shower suites; iPads available; terrace with a waterfall.

*Some lounges are open only to members or elite-level frequent fliers.

But not all lounges – whether it’s owned by the airline or independently operated – are created equal. Some are chockfull of amenities like showers, Wi-Fi, work areas, and complimentary food and beverage, while others have the bare essentials. However, with their lucrative potential, many of these lounges are upping their game by improving the experience.

To find out which lounges are getting it right, and which still need improvements, we worked with LoungeBuddy to find out what are some of the world’s best lounges worth paying the entry fee. We also looked at which lounge has the best tech amenities, and asked LoungeBuddy about the current state of the industry.

Having only launched a little more than a year ago in 2013, LoungeBuddy has already covered more than 600 airports and 2,000 lounges, and is looking to add new features and services to its app soon. “We are getting pretty close to covering pretty much every airport,” Dikman says. Between the quarter-million LoungeBuddy app users and the insane amount of travel Dikman does, that shouldn’t be long.

Modern lounges have all the amenities to help business travelers remain productive while also catering to the needs of premium leisure travelers. Many lounges now offer secluded areas for work, with plenty of power outlets and computers for guest use. Relaxation zones give those in transit the opportunity to grab a power nap in comfortable lounge chairs, and improved dining options can include hot entrees and even full bars. In addition, the recent trend of increased accessibility has allowed passengers in any cabin of service to access many of these spaces for the purchase of a day pass.

Despite being one of the easiest and most cost-effective ways to improve the travel experience, the general public still has a surprisingly limited amount of knowledge about lounges and their benefits. Airlines and operators can better promote the amenities offered inside lounges to help passengers escape the crowded terminals. Lounges can also introduce more personalized service by incorporating new technology that can track and remember guest preferences. Finally, lounge quality across brands can be further standardized to better meet guest expectations.

U.S. domestic lounges at the top of their game include American Express Centurion Lounges, the LAX Star Alliance Lounge, and the LAX Oneworld Lounge.

International lounges include Turkish Airlines CIP Lounge at Istanbul, Qantas First Class Lounge in Sydney, Lufthansa First Class Terminal at Frankfurt, Finnair Lounge at Helsinki, Cathay Pacific’s brand new lounges in Hong Kong, and Virgin Atlantic Clubhouse in London Heathrow. [These, as well as Qatar Airways’ Al Mourjan Lounge in Doha, represent some of the best exclusive lounges in the world, which means they are open to elite fliers.]

1. Turkish Airlines CIP Lounge, IST Billiards table; music room with a theater screen and La-Z-Boy style chairs; Austrian bistro; Carrera slot-car racing course.

2. Qantas First Class Lounge, SYD Complimentary spa treatments including: facials, massages; and foot and leg wraps; eight luxurious marble-lined shower rooms; a silent room called “The Library.”

3. Cathay Pacific The Wing Lounge, HKG The First Class section of the lounge offers private “cabanas” that include a bathtub, shower, and day bed.

4. Virgin Atlantic Clubhouse, LHR Complimentary spa services including foot treatments and facials; a Bumble and Bumble salon.

5. Etihad Diamond First Class Lounge, AUH Champagne bar and cigar lounge; complimentary treatments at their Six Senses Spa; nannies on-staff to watch the children while the parents relax.

*Some lounges are open only to members or elite-level frequent fliers.

Select lounges – like British Airways’ Concorde Room or Lufthansa’s First Class Terminal – are reserved for the airlines’ elite fliers, and aren’t open to all – even if you’re willing to pay for it. American Express Centurion Lounges are available only to card members. Others, like the United Club, Delta Sky Club, and Airspace, offer one-time entry fees. If you are a frequent traveler, you can sign up for club memberships with an individual lounge, or sign up for Priority Pass and Lounge Club, which offer access to hundreds of lounges around the world. Certain travel-based credit cards also grant access.

The best way to find out about lounges is with the free LoungeBuddy app, which we have used since its inception and found it to be a great resource. You can enter your itinerary and the app will list available lounges during your trip, or you can search by airport. Our favorite feature: You can enter information such as your frequent flier status, credit cards, etc., and LoungeBuddy lets  you which lounges are free to use, or how much it’d cost to get in.