Adjacent to the Harpa Concert Hall, the shoreline is lined with rocks. Many tourists can’t resist the urge to memorialize their visit by stacking the stones into small mounds called cairns. Across the Faxaflói Bay is Esja. The volcanic mountain range is popular among hikers. The numerous trails are clearly marked with boot symbols, ranging from one boot (easy) to three (challenging). Mount Esja peaks at 3,000 feet. This fails to make the top ten of Iceland’s tallest summits. Hvannadalshnúkur, in the country’s southeast corner, soars 6,922 feet.