Konradsburg, Hill castle, former monastery and manor in Falkenstein/Harz, Germany

Konradsburg is a ruined castle and former monastery set on a hilltop near Falkenstein/Harz in Saxony-Anhalt, Germany. The site includes a Romanesque crypt with vaulted passages and carved columns, along with stone walls and foundations from the other buildings that once made up the complex.

The site appears in written records for the first time in 1021, when it served as a fortress in the Harz region. After the ruling family moved to a new castle around 1120, the hilltop was handed over for religious use and became a monastery for several centuries.

The monastery began as an Augustinian foundation and was turned into a Benedictine abbey in 1133; from 1477 Carthusian monks lived here as the Charterhouse Domus Beatae Mariae Annuntiatae. They gave the site up in 1526 after the Peasants' War. The name Konradsburg comes from the noble family that left the hill after 1120 and called itself von Falkenstein from 1142.

The site is easy to walk around, with clear paths between the ruins and the crypt. A cafe nearby means visitors can take a break without having to leave the area.

The site has a medieval well that goes far down into the hillside, built to supply water to a community with no easy access to natural sources. This underground shaft is one of the least noticed parts of the site, even though the engineering behind it is worth a closer look.