The Pantheon in Rome is an ancient and well-preserved building in the Italian capital. For two millennia, it has remained almost in its original form largely due to its architecture. The Roman Pantheon is so well and simply designed that it has remained almost completely untouched by time.
It's also surprising when you consider that two different popes worship under the roof for their own purposes. Thus, the Pantheon building remained unprotected for several centuries. The age, condition, and beauty of its architectural forms make the Pantheon one of Rome's most popular tourist attractions. Of course, it is definitely included in excursions to the ancient places of the city.