Interested in Educator Travel? Check out these organizations. 

NEA Curated Grants - NEA has a collection of teacher grants on their website for international teacher travel including the Teach Earth Fellowship through Earthwatch, Grosvenor Teacher Fellow Program, Teacher at Sea, Fulbright Fellowships, NEA Global Learning Fellowship and many more. It's a great place to start if you're just curious about what's out there!  

Ecology Project International (EPI) - EPI is an organization for science teachers that provides professional development, fellowships, and student travel. EPI offers travel to Costa Rica, Yellowstone, Belize, Galapagos, and Mexico. Check out my Galapagos Travel Blog for a look at what I did when I was there.

Morpho Institute - The Morpho Institute provides professional development in the Amazon Rainforest.   

Fund for Teachers - Fund for Teachers is an organization that funds grants for teachers to better their practice, whether that be travel or professional development.