We're in pursuit of some of the world's best cyclists for today's Geo Quiz.

The "Giro d'Italia" is celebrating its 100th anniversary as one of Europe's biggest cycling races.

Top-notch cyclists, including Lance Armstrong, have been chasing each other around Italy for three weeks now.

Giro d'Italia: www.flickr.com/photos/rattodisabina

This was Day 19 of the Giro -- a grueling 102-mile-long stage -- ending with a steep climb to the top of a mountain near Naples.

And -- you guessed it -- we're looking for the name of that mountain. It's actually a volcano. Some 2,000 year ago - it erupted so violently it buried the nearby city of Pompeii.

Today it's where Italian cycling fans have come to cheer on their favorites.

OK -- take 5...to come up with the name of this volcano.

Sorry to rush you -- we meant 5 seconds...