The 54th Venice Biennale Art Exhibition opens tomorrow, and just in case you’re not familiar, it has been among the top cultural events in the world for over a century, specializing in the avant-garde and showcasing the latest trends in contemporary art. With an historically “high art” reputation like that, it’s practically begging to be co-opted by guerilla Layar ARtists.

So if you make it out to Venice this weekend, or at least before the end of November, here are a few art installments that only the “Layar elite” can see:

Manifest.AR Intervention The Cyber ARtist group returns with a series of eight “uninvited” art layers (see the full list here) consisting of their own pavilions that are actually competing with the “physical reality” pavilions via Sander Veenhof’s Battling Pavilions layer.

The Don Pigeon Placed in Venice’s famous San Marco square, The Don Pigeon stands tall among the flock of real-life pigeons for a unique photo opportunity. According to its creators, “Forget the Biennale, forget the Guggenheim, this is what you want to see this summer!”

Where’s Franco As a modern-day renaissance man, you can be sure that James Franco will be participating in a variety of activities at the Biennale. With the Where’s Franco layer, you can spot him in nine locations throughout the exhibition and even cozy up to him for a photo (let’s face it, this is the closest you’ll ever get).

Augmented reality is gaining popularity in the corporate promotion and advertising space, and Layar is a common solution for many companies. One such example which just launched this week is that of Enel, Italy’s largest energy provider, and the second largest in all of Europe.

The company’s vision for 2011 is to inspire “a future built on sustainable well-being” - a dream they say has persisted throughout the years. A TV ad shows a boy in the past tossing a paper airplane into the air and through time as it eventually lands at the feet of a boy in present day.

To help with the campaign, Enel is enhancing their billboard advertisements in airports across Europe with an augmented reality experience built on Layar. The billboards feature a marker which encourages viewers to download Layar and launch the Enel layer for additional information.

You can see the same paper airplane from the ads floating around you, and can click it to watch the video on your phone. Other 3D models include videos and information about electric vehicles and the smart grid.

You can view some of the videos at Enel’s website, and the billboard ads can be found in airports in London, Pairs, Madrid, Barcelona, Frankfurt, Brussels, Bucharest and Moscow.

On your mobile device? Click here to launch the Enel layer now!

We are very proud to announce that earlier this week the 300th layer has been launched: Places.

The layer enables you to discover tourist locations around you. You can add your own places, send your pictures and post your comments. You can also vote for your favorite POIs.

The layer is available in Australia, Austria, Croatia, Denmark, France, Germany, Italy, Netherlands, Poland, Spain, United Kingdom and the United States.

The layer was made by Pablo Garcia-Morato, Jefe de proyectos, from Elipse AD in Spain. We asked him a few questions:

You have made the 300th layer, congratulations!! What is your first reaction on that?

Well it was really a surprise because although I follow all Layer posts and new coming layers, I did not realise about the counter. And it’s good to see how Layar is growing so fast with all those incredible developers working hard every day!

What do you think is the coolest part of your layer?

I tried to join many of the Layar new features with the traditional geo-location, so apart from just knowing which places he can visit in the area, the user can also interact adding his comments and recommendations, voting for places or creating custom POIs of cool places to visit.

What are your plans for the future layer plans?

In particular with this layer, we hope to improve 3D sceneries, I mean, by now only the POI is a 3D object, but we would like to show how lived people in some places and maybe why not, imagine which could be the future of a certain location.

In general in this Layar world, I think 3D+AR opens for us, developers, a huge world of opportunities trying to let users experience things that until now have been considered science fiction.

Pablo, thanks for your answers and we wish you and Elipse good luck with your plans! Of course we want to thank all of you who developed and launched their layers before as well for publishing such cool content, making the Layar Reality Browser what it is now. Keep up the good work!