From Bratislava: Slovakia's Most Beautiful Castles – Bojnice & Trencin

Head northeast from Bratislava through the Small Carpathian mountains and across the Váh River valley. The guide introduces Slovakia's extraordinary castle density — over 180 castle sites for a country of 5 million people — and explains the political geography that created them: centuries of Mongol invasion (1241), Ottoman expansion (the Ottomans occupied southern Slovakia for 150 years), and competition between Hungarian noble families for control of the Váh corridor, the main route into the kingdom.

Trencin Castle occupies a limestone cliff above the Váh River that has been continuously fortified for at least 2,000 years. Below the castle wall, in the rock face, an inscription carved in AD 179 by soldiers of the 2nd and 4th Legions of Marcus Aurelius records a military victory over the Germanic Quadi tribe — the most northerly Roman inscription ever found, proof that the Romans temporarily pushed beyond the Danube at this point. The guide covers the castle's extraordinary history: Trencin was the seat of Máté Csák, the 'king of the Váh', who controlled northern Hungary almost independently in the 14th century; and the famous love story of Ctibor and Omaija — a Turkish concubine kept prisoner in the castle, whose lover was promised she would be freed when he dug a well through solid rock, a task that took years and which he completed.

Bojnice Castle is the most visited and most photographed castle in Slovakia — and one of the most romantic in Central Europe. There has been a castle on this limestone cliff above the Nitra Valley since at least the 12th century, but Bojnice's extraordinary appearance is entirely the creation of Count Ján Pálffy, who inherited the estate in 1882 and spent 20 years and his entire fortune transforming it into a Loire Valley château. He studied French castles personally and brought in French craftsmen. He died in 1908, the year before work was completed, and never saw it finished. The interior is remarkable: Hungarian Renaissance halls, a Gothic chapel built directly over a natural cave (whose spring feeds the moat), and a collection of European art including works attributed to Raphael's school. The cave beneath the chapel was a place of pre-Christian worship — Bojnice's layers run from pagan cave sanctuary to medieval castle to neo-Gothic fantasy.