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.
The Bolshoi Theatre is a historic theatre in Moscow, Russia, designed by architect Joseph BovÃ©, which holds ballet and opera performances. Before the October Revolution it was a part of the Imperial Theatres of the Russian Empire along with Maly Theatre in Moscow and a few theatres in Saint Petersburg. The Bolshoi Ballet and Bolshoi Opera are amongst the oldest and most renowned ballet and opera companies in the world. It is by far the world's biggest ballet company, with more than 200 dancers.