Manaus is a main port on the banks of the Negro River 1450 km inland in the heart of the Amazon rain forest, and is the main transport hub for the entire upper Amazon Basin. It also attracts crowds of tourists who find a variety of land and boat trips into the jungle. Wildlife is plentiful, even within the city, and it is home to the Pied Tamarin, one of Brazil's most endangered primates. Read more about Manaus, Brazil

Parintins is a major river port with a population of 114,000, situated on Tupinambarana Island amid the largest archipelago of the mid-Amazon. It is one of the most isolated medium-sized cities in the world, and is accessible only by air or boat. The community can trace its history back through two centuries and still proudly celebrates its traditional Indian culture. Read more about Parintins, Brazil

Macapa, Brazil, is a river port and capital of the territory of Amapa, lying on the northernmost and largest arm of the Amazon River delta, opposite the Marajo archipelago. The city lies exactly on the Equator, and the football stadium is the only one in the world where each half of the field is located in opposite hemispheres. Macapa retains some of the history of the region in its monuments. Read more about Macapa, Brazil

Castries is the capital of the volcanic island country of Saint Lucia, part of the Lesser Antilles in the eastern Caribbean Sea. Its popularity stems from the tropical weather (the dry season runs from December through May), scenery, and numerous beaches. Saint Lucia's population is predominantly of African and mixed African-European descent, and while the official language is English, French-Creole is spoken by 95% of the population. Read more about Castries, Saint Lucia

Roseau, a small, compact and most important urban settlement, is the capital and largest city of the island of Dominica, in the Caribbean. Dominica has been nicknamed the ‘Nature Isle of the Caribbean’ for its unspoiled natural beauty. Interestingly, it is built on the site of the ancient Kalinago Indian village of Sairi. Read more about Roseau, Dominica

San Juan, the capital and most populous city of Puerto Rico, is the oldest city on US territory. It is the Caribbean commercial hub, best known for its beautifully restored historic district of Old San Juan. It is situated on a rocky peninsula girded by thick walls jutting into the crashing Atlantic surf. Read more about San Juan, Puerto Rico