The Smolensk Kremlin is not a kremlin in the usual sense of a fortified inner citadel — it is the defensive outer wall of the entire old city, a massive red-brick fortification running for nearly seven kilometres in a loop around the city centre. Of the original 38 towers, 17 survive. Walking sections of the wall and climbing the surviving towers gives the most visceral sense of the city's military character.
The wall is the most impressive fortification of its period in Russia, built just before the Time of Troubles shook the country and proved the wall's necessity almost immediately. Several sections are now incorporated into parks and public spaces, making it easy to combine wall-walking with an exploration of the city. The Frolov Tower near the city centre is the most accessible entry point and has an exhibition on the wall's history. The view from the towers over the Dnieper and the surrounding city is excellent.