Yes, you can leave Brussels Airport (BRU) during a layover in 2026, provided you have the necessary travel documents. If you are arriving from a Schengen country or hold a Schengen-eligible passport (like US, UK, or EU), you can simply walk out of the terminal. Brussels is one of the easiest cities for a layover because the Airport City Express train runs every 10–15 minutes and takes only 17 minutes to reach Brussels Central Station, putting you steps away from the Grand Place and famous chocolate shops. Experts recommend at least a 6-hour layover to make leaving the airport worthwhile; this accounts for the 40 minutes of round-trip travel, security re-entry (which can take 30–45 minutes), and a few hours of sightseeing. If your layover is shorter than 4 hours, it is best to stay in the terminal. Note that if you have an "Airport Transit Visa" (A-Visa), you are strictly limited to the international transit zone and cannot pass through border control to enter Belgium.