While Google's Field Trip app may find attractions off the beaten path, it's been up to users to foot the bill for their excursions. Now, however, the Niantic Labs-made application is handing out freebies for an unspecified limited time, allowing those who wield it to waltz into 13 museums for free. Folks near the establishments will receive Free Entry cards in the "nearby" tab, which will let them pass turnstiles without forking over a dime. Although Field Trip has been beefed up with points of interest in over 80 countries, the participating institutions -- which range from The Field Museum to the Walt Disney Family Museum -- are all located in six US cities. Head past the break for the full list.

Update: Google's let us know that they've expanded the offer to include a total of 23 venues. We've revised the full list after the break. Mountain View says it's on a "first come, first served basis," so you'll want to head out there as soon as your sightseeing self can.