Challenges: 

The Expedition sets out to meet ambitious challenges.

The Summits:
The first challenge is known as ”The Summits” and the goal is to place houses on the Seven Summits, the highest mountains of the seven continents.
Map showing the Seven Summits (Image: Public domain, via Wikimedia Commons)

The Planets
The second challenge is called ”The Planets” and the goal is to place a house on each of the planets in the Solar system.

The Solar System Planets (Image: Public Domain / Farry)

The Seven Wonders of the World:

The Seven Wonders challenge has the goal is to place houses on the New7Wonders of the World, as defined by the New7Wonders Foundation. 
Map showing the location of the New seven wonders of the World (Image: Public domain, via Wikimedia Commons)