We first covered Vayable when it launched to the public just over a year ago as a way to find interesting new travel experiences around the world. It’s been growing fast since then, adding new guides at a frantic pace. And it’s also been adding new features to make finding and booking unique experiences even easier, and paying for them a lot less painless.

Vayable has just three full-time employees today, but it has managed to get about 3,000 experiences available in more than 600 cities worldwide in its marketplace. (Compare that to last April, when it had just 70 experiences listed.) In San Francisco, it just added the ability to rent out Alcatraz for the night (COOL!) and it will also play host to a Startup Crawl on September 15, which will hit up the offices of popular local startups such as Airbnb, Dropbox, Eventbrite, Weebly, and Scribd. Vayable recently joined Y Combinator, and is part of the incubator program’s summer 2012 class.

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