This cache is dedicated to the fortress wall of Kitay-gorod, which was almost completely demolished in the 30s of the 20th century. I want to show you the few preserved authentic parts of the wall that you can touch. The header shows the coordinates of the entrance to the subway.
To get the coordinates of the cache you need to find a exit 14 of the metro to Varvarka street (see photo). Under the ground there is a well-preserved part of the basement of the Varvarka tower. You can touch it!
Now count the number of identical columns in a row towards the subway (see photo). Columns near the wall should not be counted!
Cache coordinates: N55 45.0(X+6) E037 37.(857+X)
To get a spoiler hint, use GeoCheck.
Check your solution 
The cache is а magnetic micro. Please bring your own pen. Beware of muggles hanging around.
On the way to the cache, you will see a restored fragment of the wall. You can get on it from the Zaryadye park during the opening hours. You can also see a preserved section of the wall behind the glass.
Kitay-gorod (Russian: Китай-город, IPA: [kʲɪˈtaj ˈɡorət]), also referred to as the Great Possad (Russian: Великий Посад) in the 16th–17th centuries, is a cultural and historical area within the central part of Moscow in Russia, defined by the remnants of now almost entirely razed fortifications, narrow streets and very densely built cityscape. It is separated from the Moscow Kremlin by Red Square.
The origins of the name Kitay-gorod are unclear. Gorod is the Russian word for "city", derived from the ancient gord. Kita (pl. kity) is a somewhat obsolete word for "plait" or "an item made by braiding".
The walls were erected from 1536 to 1539 by an Italian architect known under the Russified name Petrok Maly and originally featured 13 towers and six gates. They were as thick as they were high, the average being six meters in both dimensions. The last of the towers were demolished in the 1930s, but small portions of the wall still stand. One of two remaining parts of the wall is located in Zaryadye and the other near the exit from the Okhotny Ryad station of Moscow Metro behind the Hotel Metropol.