Slovenia's landscape is as varied as it is beautiful: along the Austrian border the Julian Alps provide stunning mountain scenery, most accessibly at Lake Bled and Lake Bohinj ; further south, the brittle karst scenery is riddled with spectacular caves like those at Postojna . Slovenia's capital, Ljubljana , is easily the best of the cities, a vital, youthful place, manageably small and cluttered with Baroque and Habsburg buildings, while the short stretch of Slovenian coast, along the northern edge of the Istrian peninsula, is punctuated by a couple of towns that were among the most attractive resorts of the former Yugoslavia - Piran and Portoroz - not to mention the port of Koper , with its appealingly ancient centre. Despite its relative isolation in the eastern part of the country, the attractively preserved town of Ptuj is also well worth a visit.