Sizzling thermal waters flow from volcano-heated springs in remote, rugged Patagonia. It’s the ideal spa destination for those who want some eco-adventure when they emerge from the therapeutic waters. The most decadent spa address is Puyuhuapi, in the north of the region, accessible only by boat.

Cartagena, a gorgeous fishing village on Colombia's Caribbean coast, has excellent beaches, a historic old town (that's entirely walkable) and beautiful colonial architecture. It's also one of the safest places in the country, so it's no wonder it's a popular port of call for cruise ships. Need a break from exploring the cobblestone streets? Stop at an outdoor cafe for excellent pastries and people-watching.

How often do you get the chance to walk through a tunnel of lava? Created by the flowing and cooling process of liquid magma, the underground lava tubes of Santa Cruz are simply breathtaking. The most popular is the Tunnel of Love, so named for the heart-shaped hole in the ceiling. Cool down with a splash in the fresh waters of Puerto Ayora, snorkel at Tortuga Bay or the mangrove-lined Garrapatero Beach and get friendly with the giant natives at the El Chato Tortoise Reserve.

Namibia's largest coastal town is a huge draw for merrymakers and vacationers from all over the globe. This seaside resort showcases its German origins in its European-style colonial architecture, creating a jarring juxtaposition against the landscape of the Namib desert. Sandboard or motorbike the dunes, dine and imbibe in a picturesque restaurant on the waterfront, or just marvel at the unusual birds and plants that populate the region.

This coastal city is one of the oldest in Morocco and naturally has a rich history. It is a big fishing port and a beautiful coastline near the less industrialized areas. The fishing port is definitely something to take a look at. Many vendors at the markets sell cool pottery, so have a look there.