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.
Anyway here is my utterly subjective top 30 of most beautiful churches in Europe. St. Michaelâs monastery (Kiev, Ukraine) St. Michaelâs Golden-Domed Monastery (c) Matt Shalvatis. There are so many glorious churches in Kiev, and even more in the Ukraine, that this one was quite difficult to chose.