Fancy airport lounges aren't just for First Class passengers.
Many airlines offer day passes that cost around $50, or an annual membership with alliances like Star Alliance or Oneworld can be had for $250 to $400. Some credit card companies also include lounge access as a perk.
The amenities vary, but travelers are usually treated to cushy chairs, lots of space, open bars and hors d'oeuvre-style nibbles, if not full meals. Free Internet generally comes standard, and some offer complimentary massages, reclining chairs and showers.