If where you live is covered in pollen that has you battling all of those miserable allergy symptoms, it may be time to take a “sinus sabbatical.” Based on the 2026 Allergy Capitals report from the Asthma and Allergy Foundation of America, the travel website Booking.com came up with the top 5 cities that not only offer relief for allergy sufferers, but they are favorite destinations for travelers.