Who's Your Favorite Adventure Travel Company?

I've listed a bunch of my favorites, based on feedback from many travelers who enjoy exploring the world. Trips offered by these adventure travel companies will take you just about anywhere in the world, on bare-bones to luxe trips. All offer special experiences that can range from dining and overnighting in locals' homes in Asia to mountain biking in Peru or private tours of ancient ruins. Check out this list of adventure travel companies and let me know who you think I'm missing.