Concordia: Roma/Sicilia is an expansion for Concordia that provides a double-sided game board for two different experiences:

In Roma, you build the eternal city with famous places like the Colosseum, Forum Romanum, Circus Maximus, or Pantheon. Send your colonist ships abroad to gather extra benefits. On the island of Sicilia, coincidental eruptions of the volcano Etna may hit you. It's a new element of luck, but Sicilia can be played without that option as well.

—description from the designer