Two related wonders I would like to see are...
Gotthard Tunnel... . The Swiss deserve a wonder. A one tile industrial era wonder that allows movement through a mountain tile. Also gives a free trader and route and creates roads from the source city to the tunnel and from the tunnel to the closest player or allied city.
Panama Canal ... A two tile industrial wonder that allows the movement of naval units through land tiles. Both ends of the canal must be on coast or adjacent to the city centre.
Gotthard Tunnel... . The Swiss deserve a wonder. A one tile industrial era wonder that allows movement through a mountain tile. Also gives a free trader and route and creates roads from the source city to the tunnel and from the tunnel to the closest player or allied city.
Panama Canal ... A two tile industrial wonder that allows the movement of naval units through land tiles. Both ends of the canal must be on coast or adjacent to the city centre.