El Salvador's capital and largest city lies in a valley at the foot of the large San Salvador volcano. Shanty towns abound and the streets are lined with people selling everything.

Serbia is a country where centuries-old monasteries sit just a short drive from lively cities, and where the past is never far from daily life. In Belgrade, the capital, Kalemegdan Fortress offers panoramic views where the Danube meets the Sava River. This fortress has witnessed more than 100 battles and been rebuilt many times over two millennia. Within its walls are Roman ruins, an open-air military museum, and quiet park paths perfect for wandering between centuries of layered history.

Corpus Christi is a coastal city on the Gulf of Mexico in southern Texas, set along Corpus Christi Bay and separated from the open Gulf by Padre Island and Mustang Island. Its landscape includes broad beaches, tidal flats, coastal wetlands, and shallow bays that support a wide range of marine and bird life.

This city in the Rhine Gorge is known for its winemaking, dramatic landscapes and 15-minute cable car ride to the Niederwald Monument (celebrating the German victory over France in 1871).

Touba is a major religious city in central Senegal and the spiritual center of the Mouride Muslim community. Located in the Diourbel Region, the city is dominated by the Great Mosque of Touba and the mausoleum of Sheikh Ahmadou Bamba, founder of the Mouride order.