"One of the most popular day trips from Reykjavík , this dramatic and scenic rift valley is both the historical site of Iceland ’s Viking parliament and a geological wonder in its own right. Amongthe highlights arethe Almannagjá cliffs, where the island’s chieftains and most of the Icelandic population traditionally congregated for an annual Alþing (general assembly), the last of which was held as recently as 1798. Wooden walkways around the park lead to other sites of interest like the black-roofed Þingvellir Church and Þingvallavatn, the largest natural lake in Iceland . There are also waterfalls, flower-filled valleys, and abundant wildlife. It is possible to organize a diving trip to explore the tectonic rift that divides the Eurasian and North American plates, and there’s a visitor center with great views and decent coffee as well as exhibitions and a gift shop."