Take the free park shuttle to the Temple of Sinewava, walk one mile to the end of the paved walkway, and begin hiking up the river. Two hours upstream, at the intersection with Orderville Canyon, hikers will encounter the narrowest and most spectacular section of the Zion Narrows.
Photograph by Mike Segar, Reuters Second City is back in second place, at least when it comes to height. New York's One World Trade Center will officially open next year as America's tallest building, topping Chicago's Willis Tower by 325 feet (99 meters). The distinction hinges on a definition. According to the Council on Tall Buildings and Urban Habitat, the needle atop the new trade center is a spire, not an antenna.
The Twin Towers. The two towers were different in height: the first one, built in 1972, reached a height of 417 meters and the second one, finished one year later measured 415 meters. The One World Trade Center was the tallest building in the world until 1974, when the Sears Tower was built in Chicago.