Frankfurt is widely considered one of the best layover cities in the world, especially for international travelers transiting through Europe. Frankfurt Airport (FRA) is a "mega-hub" that functions like a small city, offering extensive amenities such as "NapCabs," 24-hour showers, movie worlds, and even a flight simulator. One of its greatest advantages is its proximity to the city center; the regional S-Bahn train (lines S8 and S9) can take you from the airport's Terminal 1 to the "Hauptwache" station in the heart of Frankfurt in just 15 to 20 minutes. This means that even with a 5-to-6-hour layover, you have enough time to visit the historic Römerberg (old town square), walk along the Main River, and enjoy a traditional "Ebbelwoi" (apple wine) before heading back. For longer layovers, the airport's central location in Germany makes it a perfect starting point for quick train trips to nearby scenic towns like Mainz or Heidelberg. In 2026, the airport also features "Fast Lanes" for connecting passengers, significantly reducing the stress of re-clearing security between international and domestic European flights.