Most famous are the three imperial arches remaining in the city of Rome: the Arch of Titus (AD 81), the Arch of Septimius Severus (AD 203), and the Arch of Constantine (AD 312).
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The Gateway Arch is a 630-foot-tall (192 m) monument in St.Louis, Missouri, United States. Clad in stainless steel and built in the form of a weighted catenary arch, it is the world's tallest arch and Missouri's tallest accessible building.
The Pantheon of Rome is regarded as the oldest building in the world still in use (even if it is dedicated to a different deity these days). It is truly a national treasure of Italy - it is considered the best preserved ancient Roman monument and the most copied.
In a park with over 2,000 stone arches, this particular free-standing arch has become a widely recognized symbol of the state of Utah and one of the most famous geologic features in the world. The light opening beneath the arch is 46 feet high and 32 feet wide, making it the largest free-standing arch in the park.