The Russian (often mistaken for Greek) Orthodox Church on the Neroberg Park in Wiesbaden.

This was built between 1848-1855 as a tomb and chapel for Elizabeth Michailovna, Duchess of Nassau and Grand Duchess of Russia,
niece of the Russian Tsars Alexander I and Nicholas I. Barely a year after her marriage with the pious Duke Adolf of Nassau she
died at childbirth - along with her newborn child. And noooo - that's definitely NOT her ghost as seen in the foreground! :-p