Seconding Harpa via covidtest.is. Details below since I searched this so many times leading up to our trip from Dulles in April. We made an afternoon of our trip to Harpa, exploring the lobby, taking the Sculture & Shore Walk to the Sun Voyager sculpture and visiting the hot dog stand, Bæjarins Beztu. We had our results within 30 minutes and presented them several times at the airport about 30 hours later, first entering the line to check in and at check in itself, so keep your QR code out. Two things I was worried about were fine: 1) missing the appointment (we reschedule a whale watch; I emailed [email protected] to push our appointments back and they confirmed kindly promptly, and intimated when we got there a few minutes late the time didn't really matter and felt more like a walk in clinic. 2) I didn't know of each individual had to