Massive storage capacity
The best view of the Barrel Building is from the Great Terrace. The Gothic windows installed when the functional building was constructed in the 16th century, were entirely out of fashion. The reason why its builder, Johann Kasimir, uncle and guardian to Friedrich IV, chose them remains a mystery to this day. A giant barrel was installed in the building's basement in 1591, holding 130,000 liters of tithe wine from the Palatinate.