In most cases, pulmonary embolism is caused by a blood clot in the leg that breaks loose and travels to the lungs. A blood clot in a vein close to the skin is not likely to cause problems. But having blood clots in deep veins (deep vein thrombosis) can lead to pulmonary embolism.
St. Petersburg. 1  St. Petersburg is a city with a long and eventful history. 2  Altai is perhaps the most beautiful region of Russia. 3  Moscow is the capital of Russia, as well as the nationâs epicentre of arts, music, science, academics, and politics.  For a step back in time, Olkhon Island is a wonderful place to visit.
Russia's other mountainous territory is in its extreme south, in the Northern Caucasus. There you will find Europe's tallest mountains, which tower in height over the Alps, including mighty Elbrus. Favorite Russian resorts in the area include those at Sochi (which hosted the 2014 Winter Olympic games) and Dombai.