If you know what this is, and where it is located, you could be eligible to win a prize in the CNET Road Trip Picture of the Day contest.

Update (Tuesday, 6:18 p.m PDT): The answer to today's challenge--which 237 people got--is I.M. Pei's pyramid at the Louvre Museum in Paris. Thanks to all who played and to everyone, please come back for tomorrow's challenge.

Welcome to the Road Trip Picture of the Day contest. This is your chance to win some cool prizes as you test your skills at recognizing pictures.

If you followed my previous Picture of the Day challenges, you know that each day I'll be posting a new photograph from my various travels, and your job is to try to correctly identify it using any means at your disposal. Throughout Road Trip 2011, which will take me to a number of countries in Western Europe, there will be a new challenge each and every day.

The format will be a bit different this time around, however. Instead of a daily prize, I'll be giving both a weekly prize and one grand prize at the end of my Road Trip project. Here's how it will work:

For the weekly prize, I'll pick a winner at random from among all those who correctly identified one of that week's daily challenges. You get one entry into this drawing for each correct entry you submitted that week.

For the grand prize, which is a major brand video game console, the winner will be the person who answers the most daily challenges correctly during the entire project. So there's definitely an incentive to play every day and to answer correctly as often as possible. Be warned: Last year, there was no shortage of people who had the right answer most of the time, so the competition for the grand prize will be stiff.

Given the constraints of the work I'll be doing on Road Trip, I have to minimize the complexity of the Picture of the Day challenge, so if you want to accumulate right answers and compete for the grand prize, you must use the same e-mail address and name each time. If you use a different name or e-mail address, your answers won't all be counted together.

For complete information and rules about the Picture of the Day challenge, please click here.

And now on to today's challenge.

If you know what this is, and where it's located, please send me an email with both pieces of information (to daniel*dot*terdiman--at--cbs*dot*com) by 6 p.m. pacific time today.

Please note: in order to be considered, you must include the phrase "Picture of the Day challenge" in the subject line of your email. If you respond in any other way, I cannot guarantee that your entry will be counted.

And please forgive me if you don't hear from me if you're not the winner. I get dozens of responses each day. Also, I've turned off comments because otherwise people will post the correct answers there. I hate to shut down discussion, but I want you to figure out the answer on your own.

Good luck today, and throughout the summer.

The disclaimer: NO PURCHASE NECESSARY TO ENTER OR WIN. MUST BE A LEGAL RESIDENT OF ONE OF THE 50 UNITED STATES OR D.C., 18 YEARS OLD AND AGE OF MAJORITY OR OLDER IN STATE OF RESIDENCE AT DATE OF ENTRY INTO SWEEPSTAKES. VOID IN PUERTO RICO, ALL U.S. TERRITORIES AND POSSESSIONS AND WHERE PROHIBITED BY LAW. SWEEPSTAKES ENDS 11:59:59 PM PT ON 8/7/11. SEE OFFICIAL RULES FOR DETAILS.