Elevate Destinations has been called the Warby Parker of travel: Every journey booked -- whether it’s a foodie tour in Bolivia or a trek through Bhutan -- enables an underserved group of children to visit an important site in their home country (Machu Picchu in Peru, for instance).
If you want to get your hands even dirtier, WWOOF places volunteers on organic farms, from olive groves in Greece to a vineyard in Patagonia. Guests typically live with families, cook what they pick, and linger over laid-back meals.
Adventures in Preservation
History and architecture buffs will love Adventures in Preservation, which operates in the U.S. and Europe. Retreats include sleeping in a French chateau while helping to restore its 19th-century kitchen and chapel; or, in Virginia, you can excavate a 1600s plantation manor house.