Hartenberg, Gothic castle in Josefov, Czech Republic.

Hartenberg is a ruined Gothic castle converted into a château on a rocky spur above Hřebeny, on the right bank of the Svatava at 510 m. Its dominant feature is a massive rectangular tower with an irregularly rounded face built on a rock block, entered at height through a portal from around 1400. A lower ruined wing with peeling yellowed plaster and tall window openings extends beside it.

Hartenberg was probably built around 1200 as a border castle by the lords of Hartenberg; the first undisputed written record dates from 1345, when it was a royal fief. In 1364 Těma of Koldice sold it to Charles IV, who had already exchanged it with him two years earlier for property in Bautzen. The Hartenbergs held it until 1362.

The castle's name comes from the Hartenberg family, who held it until 1362. A brewery was founded at the estate in 1603, and its ruin stands below the castle on the path up from the Hřebeny railway station. Since 2000 volunteers from 76 countries have worked here in INEX workcamps.

Visitors can tour the castle during ongoing restoration work that demonstrates craftsmanship and offers insight into medieval building methods. It helps to wear comfortable shoes since paths across the grounds can be uneven and sloped.

The castle chapel of the Holy Three Kings in the palace's second floor was consecrated after Mates Šlik restored the derelict castle in 1471; sources date its vaulting to that late-Gothic rebuilding, though one mentions the chapel as early as 1462. Its cross-ribbed vault on two central pillars was later renewed.