Left 4 Dead/The Church

From a train cart, make your way to the church.

Paths
The first area is open - but you need to go to the opposite corner of the area to reach the stairs.

Follow the roadway to an abandoned cottage, where you may be able to collect another weapon.

Proceed to the through behind the ambulance.

Traps

 * The safehouse is occupied by a paranoid individual, who is most interested in his short-term personal safety. As the safehouse is a church, he has access to the bell to call the Lord's children to the congregation - even if they are infected.  He eventually succumbs to the infection and turns into either a Hunter, Boomer, or Smoker, as decided by the Director.