Usachev has experience dealing with the consequences of a long-term stay in space, having spent two long-duration missions on the retired Russian space station Mir.

CNN: Discovery brings home Alpha crew

The cardinals stay in the Casa Santa Marta, a Vatican City hotel, for the duration of the conclave, moving from there to the Pauline Chapel to pray or the Sistine Chapel to vote.

CNN: March 13, 2013 -- Updated 1133 GMT (1933 HKT)

Go to the site's vacation budgeting estimator and punch in your destination, the number of days you'll stay, the duration of your trip, number of people travelling and related information.

BBC: Tracking travel rewards