Minceta may very well be the crown jewel of Dubrovnik's defensive citadel. Guarding the north end of the Old City, this massive stone tower is the most prominent point on these UNESCO-awarded walls which, much to the pride of Croatians everywhere, have never been breached by an invading army. For the price of 70 kuna (around $13), you can take in the fantastic views from the base of its crown (designed by famed Croatian architect Juraj Dalmatinac), then head off for a walk around all 1.94 kilometers of the wall's length. It's not the most novel thing to do in Dubrovnik, however, and for a price of 0 kuna you can easily appreciate the magnitude of this structure from the ground. Still, if you're a stickler for saying you've done things and don't mind sharing the scenery with lots of other amateur photogs, you'll likely enjoy the experience from the top.