Single Point Perspective…

Bath Abbey
Bath Abbey

…Horizontal lines parallel with the plane of the image are static whilst all others are drawn to a single point on the distant horizon.

Two Point Perspective…

Brighton Train at East Croydon
Brighton Train at East Croydon

…the lines from two distinct points on the horizon give shape to the Office block that dominates the image.

You can read about the Weekly Photo Challenge at http://dailypost.wordpress.com/2014/03/07/photo-challenge-perspective/