IMG_20190717_072008 A sewage canal from 16th century
These two beautifully restored red brick arches look inviting, as if tempting you to go on an adventure -- but actually that's a sewage canal through which wastewater flowed from the castle kitchen into a canal outside of the castle walls.
Here is what the official sign next to it says:
"Waste water from the Palace kitchen would flow down along this stone-paved trough.
Outside the palace, the canal was connected to a brick underground sewer installed in the second half of the 16th century. The sewer, built westward of the Palace's northwest corner, was meant to direct the waste water from the Palace into a canal outside of the Lower Castle's defensive wall. The length of the part of the sewer that reached the defensive wall was around 26 meters. This part of the sewer is around 2 m high and around 1.8 - 1.9 m wide. Inside the sewer was an empty space around 1.5 m high and 0.8 m wide."
The Palace of the Grand Dukes of Lithuania was originally built in 1500s, underwent much historical turbulence, was completely destroyed in the beginning of the 19th century, and restored during the 2000s and 2010s. It is currently a museum.