Each person non resident of the Russian Federation prior to applying for visa in the consulate must get an invitation according to the purpose of his or her visit.
Your Visa To Russia provides invitations for tourist and business trips.

Treasure hunters comb world’s deepest lake

The Russian Empire's lost gold may be buried at the bottom of Lake Baikal.

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Source: http://rt.com/prime-time/2010-08-30/russian-empire-treasure-baikal.html