Enclosed within a protective wall reaching up to 20 metres in width, the Ciudad Amurallada (or Walled City) is Cartagena's old beating heart. Packed with well-preserved colonial buildings, it's a pleasure to stroll through; its streets of colourful low-rise merchant homes marked by iconic balconies are now mostly walked by either tourists or students who attend classes at the University of Cartagena during the day and linger for meals and nightlife after school is out. Cafes in Plaza Aduana and Plaza Santo Domingo teem with patrons, forging an incredibly jovial atmosphere; the districts of San Diego and El Centro are two not to be missed. There is plenty of food and shopping to be had, with a mixed bag of world-class restaurants and street food hawkers and the incredibly photogenic palenqueras — women dressed in vibrantly coloured clothing selling fruit in the streets — images of whom have become emblematic of Colombia as a travel destination.

The bastion itself might not be much to look at, but the views that open up beneath are some of the best one can get. Take the walk uphill from Sarajevo's historic old town, passing the sobering cemeteries to those who fell in the Bosnian War, and reach the sole open-air café with unbeatable vistas.

Smaller and less detailed than the Prehistoric Museum, this one focuses more on sculptures, pottery, and artefacts from the Classical and Hellenistic periods. It’s right in Fira, so easy to drop into if you're nearby, but it’s best paired with the Prehistoric Museum to get the full picture of Santorini’s ancient past.

To gain better understanding of old Bosnian lifestyles, visit the beautifully preserved, authentic home-turned-museum Svrzo House. The house gives visitors a good understanding of what a typical Muslim home in the area could have looked like in the late 18th-early 19th centuries.