On Saturday, March 22, we were introduced by our friends Manuel and Alejandra to the beautiful natural attraction “Prismas Basalticos” near the town of Huasca de Ocampo ( http://en.wikipedia.org/wiki/Huasca_de_Ocampo ) in the mountains of Hidalgo State. We arrived early enough to beat the heat and the crowds, which added a lot to our enjoyment of this wonderful treasure. The walls of the canyon are lined with the “prisms”, columns of basalt 30 to 50 meters tall, with cross-sections in the form of pentagons or hexagons, formed millions of years ago by lava cooled by ice. Combined with the waterfalls coming down the canyon from the dam upstream, and with the tasteful and convenient steps and bridge provided, this is truly a superb natural wonder. There are very few comparable sites known: one in Northern Ireland is a World Heritage site. See http://srsddn.hubpages.com/hub/Columnar-Basalts-of-the-World for more details.