This might not be the coolest time of year to visit the tallest cactus in the world, but you can't miss it if you head to the Sonora Desert in Baja California, Mexico where, according the Guiness World Records 2007 edition, the tallest of the tall Cardon (Pachycereus pringlei) measured 63 feet (19.2 m) in April of 1995. The books also states that this height is about as tall as four giraffes.
For a look at all sorts of desert cactus, the Cactus Garden at the Arizona -Sonora Desert Museum in Tucson has an extensive collection. This place looks stunning. It's a zoo, a botanical gardens, gallery and natural history museum designed promote a love of nature– particularly the desert.