Dominica, known as the “Nature Island of the Caribbean,” is a haven for eco-tourists and adventure seekers. Nestled between the French islands of Guadeloupe and Martinique, this lush island boasts a remarkable landscape of volcanic mountains, dense rainforests, and stunning waterfalls. Dominica’s most iconic natural wonder is the Boiling Lake, the second-largest hot spring in the world.

Southeast Spain's seaport of Cartagena is a large naval base on the Mediterranean coast. The city was founded in 220 B.C. and boasts Roman ruins, mosaics and murals.

Bangladesh, set in the heart of South Asia, is known for its lush greenery and waterways. It is often described as the “land of rivers,” with the Ganges, Brahmaputra, and Meghna weaving through its landscapes.

Las Palmas (officially Las Palmas de Gran Canaria) is the capital of Gran Canaria island as well as co-capital (along with Santa Cruz de Tenerife) of the Canary Islands. It is a major cruise-ship port known for duty-free shopping and sandy beaches, including Playa de Las Canteras, considered by many to be one of the best urban beaches worldwide.

Ullapool is a village in the Scottish Highlands about 65 miles north-west of Inverness. Ullapool is known for the progressive, ecologically sound practices of its inhabitants and is the center for the Highland Environment Centre; a project of the Highland Eco Trust.