Šemnická skála, Natural monument in Karlovy Vary District, Czech Republic

Šemnická skála is a phonolite dome whose eastern slope rises about 165 m above the surrounding terrain. The bedrock is Karlovy Vary granite penetrated by volcanic lava, classified on geological maps as trachyandesite. The summit offers views of the Ohře valley, the Doupovské hory and the Krušné hory.

The site was first protected on 15 September 1933 under the name Olšová vrata, covering 3.79 ha. In 1974 it was incorporated into the Slavkovský les Protected Landscape Area, and on 19 July 2006 it was enlarged to 8.41 ha and renamed Šemnická skála. The summit cross commemorated a girl who, according to legend, escaped marriage to the last lord of Engelsburg by feigning a jump; the lord fell 100 m to his death.

The rock was first recorded as Panenský skok (Jungfernsprung, "Maiden's Leap"), named for a legend in which a girl fleeing marriage to the cruel last lord of Engelsburg feigned a jump and hid below the summit while he spurred his horse over the edge. A cross on the summit commemorated the event; it no longer stands. Later names include Hermannstein, after Hermann Czernin von Chudenitz, and from the 19th century Schömitzstein.

A yellow-marked educational trail of the Andělská hora–Kyselka route climbs from Andělská Hora, while a red-marked path comes from Dubina; another marked trail leads up from Karlovy Vary. The summit cross is gone and the former Hermannstein inn below the rock has vanished, leaving a rest area with a drinking-water well. The eastern slope drops about 165 m to a small dammed lake.

The summit cross commemorated a girl who, according to legend, feigned a jump from the rock to escape a cruel lord; he then fell to his death. The cross is gone, and the former Hermannstein inn below the rock survives only as a rest spot with a spring.