The Editor

Ollantaytambo is a town and archaeological site located at the northern edge of the Sacred Valley. It was a military, religious and agricultural center. At the time of the Spanish conquest of Peru, it was a stronghold for the Inca resistance and is the only Inca town that is still inhabited.

Main Ridge is the primary mountainous spine of the island of Tobago in the southern Caribbean. The Main Ridge Forest Reserve, which encompasses about 10,000 acres of tropical rain forest, is one of the oldest protected areas in the world.

The Nazca Plate is an oceanic tectonic plate in the southeastern Pacific Ocean off the west coast of South America. Its subduction beneath South America is responsible for the Andes Mountains. The Galápagos hotspot is responsible for the Galápagos Islands.

The Cocos Plate is a tectonic plate beneath the Pacific Ocean off the west coast of Central America. It is named for Cocos Island, which is the only emergent island of the plate.

Yendegaia National Park is located in the Magallanes y la Antártica Chilena Region of extreme southern Chile, within the Tierra del Fuego archipelago. The Darwin Range and Lake Fagnano frame its pristine landscapes.

Maras is a small town in the Cusco Region of Peru. Salineras de Maras, which date to pre-Incan times, are salt-evaporation ponds in the form of stepped terraces, that descend to the Rio Vilcanota and the Sacred Valley of the Incas.

Home to the Aymara indigenous people, Sajama National Park is situated in Bolivia's Cordillera Occidental. It includes Nevado Sajama, an extinct stratovolcano and the highest peak in Bolivia. Its primary objective is for the protection of the native queñoa tree.

Manzana de las Luces ("Block of Enlightenment") is where in the late 17th century the Jesuits built their residence, the Saint Ignacio Church and adjoining College. It is located in Monserrat, a neighborhood that features many of the historic and important public buildings in Buenos Aires.

Queulat National Park is located in the Aysén Region of southern Chile. It protects glacier-capped mountains and virgin evergreen Andean Patagonian forests. The park's centerpiece is the Queulat hanging glacier (Ventisquero Colgante).

The Central America Volcanic Arc is a chain of volcanic formations that extend from Guatemala to Northern Panama, parallel to the Pacific coastline of the Central American Isthmus. They range from major stratovolcanoes to lava domes and cinder cones.