Trosky Castle is located on the summits of two basalt volcanic plugs. On the lower peak, 47 metres, is the two-storey structure called Baba (Crone), and on the higher outcrop, 57 metres, is the four-sided structure known as Panna (Maiden). The castle is a landmark of the Bohemian Paradise region.
The castle was established by Čeněk of Wartenberg in the second half of the 14th century. Two towers were constructed, one on top of each rock, and various residential buildings and outhouses were erected between them. Three rings of fortified walls protected the complex. After Čeněk's death the castle came into the possession of King Wenceslaus IV, from whom it was acquired by Otto III of Bergau. Though Otto IV of Bergau was a zealous Catholic, it did not stop him raiding the monastery in Opatovice and stealing its famous treasure, which he is said to have hidden in Trosky Castle, supposedly in an underground cellar blocked by a huge boulder. No one could move the boulder, which was eventually covered by scree, permanently cutting off the way to the precious objects.
During the Hussite Wars Trosky was a centre of the pro-Catholic sides. It is therefore not surprising that in all probability the castle was never completely conquered by the Hussites or any other enemies. As late as 1428, shortly after the castle burned down, it was under siege by Jan Královec, captain of the Taborites Army. From 1438 onwards the robber knight Kryštov Šov of Helfenburg and his companion Švejkar settled in it to tyrannize the villagers in the surrounding countryside, before the people of Görlitz and Zittau, members of the Lusatian League, banded together to capture them. Margareth of Bergau, the widow of the original owner Otto of Bergau, made Trosky into her residence by 1444. In 1468 the castle was property of William of Hasenburg who kept it until 1497. After that several noble families owned the castle, although its significance declined. In 1648, during the Thirty Years' War, it was burned down completely by the Imperial Army and left in ruins. In 1681 the enlightened Jesuit Bohuslav Balbín visited it; possibly the first documented example of a trip, the sole purpose of which was to research a historical site or area.
In the 19th century a greater degree of interest was shown and romantic modifications were made to the ruins of the castle. It was decided to create a staircase leading to the Panna tower. Work has begun in 1841–43, but was not completed.
The Jan Hus Memorial stands at one end of Old Town Square. The huge monument depicts victorious Hussite warriors and Protestants who were forced into exile 200 years after Hus, and a young mother who symbolises national rebirth. The monument was so large that the sculptor designed and built his own villa and studio where the work could be carried out. It was unveiled in 1915 to commemorate the 500th anniversary of Jan Hus' martyrdom. The memorial was designed by Ladislav Šaloun and paid for solely by public donations.
Born in 1369, Hus became an influential religious thinker, philosopher, and reformer in Prague. He was a key predecessor to the Protestant movement of the sixteenth century. In his works he criticized religious moral decay of the Catholic Church. Accordingly, the Czech patriot Hus believed that mass should be given in the vernacular, or local language, rather than in Latin. He was inspired by the teachings of John Wycliffe.