I'm in Moscow but just in transit...meaning, I'm waiting on my connecting flight.
You need a visa to enter Russia from the U.S. and apparently anywhere else. While it might have been possible to try for one, I didn't worry about it. It's a long day of hanging out at the airport but I can handle it--I think.

The last time I had a layover like this i was a lot younger...1994...my first trip to Zambia and the layover was in London. I caught the Tube and spent the day at a couple of museums. Even if I could have gotten in, it was about 27 degrees outside when I arrived and it just looked cold.