Photo of the Day (7.13.10)

The Pantheon in Rome is an unmistakable icon and marvel of engineering, construction, and design. Almost two thousand years after being built, it is still the largest unreinforced concrete dome in the world. The name "Pantheon" is speculated to originate from the many statues of gods placed in the building, or from the resemblance of the dome to the heavens.

Today's Photo of the Day, from Flickr user tysonwilliams really puts the overwhelming geometry and scale of the dome's ceiling into perspective - thanks to good use of light, shadow, and a little creative post-processing.

This week, Travel Talk is headed to Rome - and we'll be sharing all of our favorites in Italy's capital. Tune in to see all of the ancient Roman attractions as well as a few lesser known spots & surprises...