Mount Elbrus (5,642 m / 18,510 ft) is the highest mountain in Europe. It's a dormant stratovolcano in the Caucasus Mountains, straddling the border between Russia (Kabardino-Balkaria) and Georgia.
Its twin summits (west slightly higher) are popular climbing objectives. The standard route uses cable cars to 3,800 m, then glacier travel. Despite altitude, it's considered a non-technical ascent in good conditions.