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.
9: Sweden. Sweden ranks No. 9 among most peaceful countries by the Global Peace Index this year. Located in the far north of Europe, Sweden is one of the most beautiful Scandinavian countries on earth. The country has a low level of robberies (only 9,000 a year) compared to the United States (about 350,000 a year).