These magnificent limestone caves feature delicate shawls, grand columns, underground pools and amazing chambers. You can explore five caves created from a belt of limestone laid down about 440 million years ago. The caves are set inside the deep gorges and rugged bluffs of the Yarrangobilly River Valley at the north of Kosciuszko National Park. Bring bathers to enjoy the natural thermal pool which is a constant 27°C.

A feat of Spanish colonial military architecture, the Castillo San Felipe de Barajas is one of Cartagena's most prized attractions. The fortress, whose construction finished in the late 18th century, was never seized — and not for a lack of attempted forays. Part of its sophisticated system of underground tunnels is open to the public. A guided tour (audio guides available) is highly recommended.

Learn about pirates and their long history fun of dangers and adventures at the Pirates Treasure Museum. The interactive environment with videos, hands-on activities and lots of visuals won't leave you bored. You can learn to tie the various knots and imagine what life would be like back in the pirate era.

Once the first free settlement in the Americas, founded by those who escaped slavery during the colonial period, the town of San Basilio de Palenque still stands today, and with it the unique culture of its inhabitants. A portion of the population still speaks palenquero, a creole tongue that emerged from a mix of several European and African languages, now used almost exclusively in San Basilio de Palenque. Music and dance occupy a place of paramount importance in residents' lives, with the Drums and Cultural Expressions Festival held annually in October. The palenque cuisine deserves a separate mention — a culinary tradition upheld by inhabitants of a small Colombian village has garnered international acclaim, with a cookbook written in the town receiving the highest prize at the Gourmand World Cookbook Awards in 2014. If your schedule happens to be too tight for a dedicated day trip (which earns our highest recommendation), try some of the tropical fruit sold by palenqueras in downtown Cartagena. The village was named Masterpiece of the Oral and Intangible Heritage of Humanity by UNESCO in 2005.