The United Nations Foundation has tapped the expertise of travel site Expedia.co.uk in promoting sustainable tourism and awareness of world heritage sites. Under this alliance, profits from trips booked to designated world heritage sites made via expedia.co.uk will be donated to Friends of World Heritage for investment in local community projects at world heritage sites in need.

There are 812 designated world heritage sites across 127 countries that are currently protected by the 1972 World Heritage Convention. These include known sites such as the Great Barrier Reef in Australia and England's Stonehenge, and lesser known but equally important places such as the Garamba National Park in the Democratic Republic of Congo, and the sub-Antarctic islands of New Zealand. Sian Ka'an, Mexico - a large world heritage site found on the eastern coast of the Yucatan peninsula - will be the first world heritage site to benefit from the initiative.

Trips to the following world heritage sites are available through Expedia.co.uk
- Pueblo de Taos, New Mexico.
- Central City in Prague, Czech Republic.
- Taj Mahal and sites near New Delhi, India.
- Volcanoes National Park in Hawaii (Big Island).
- Yosemite National Park by Fresno/Modesto, California.
- Great Pyramids and Nubia Monuments in Egypt.
- Chichen-Itza and Uxmal, near Merida, Mexico.
- Fortified town of Campeche, near Merida, Mexico.
- Angkor Wat in Cambodia and other Buddhist temples throughout Cambodia, Laos, Thailand and Vietnam.
- Machu Picchu, City of Cuzco, and Historic Centre of Lima, Peru.
- Serengeti and Ngorongoro Crater, Tanzania.