Here are a few photos that I've taken over the past year or two that all have something in common: vanishing points. A vanishing point is a point in a perspective drawing to which parallel lines seem to converge.
Roman Arches - A covered walkway lining the Plaza del Obradoiro in Santiago de Compostela, Galicia, Spain.
Muslim Wall - Atop a wall protecting an ancient Muslim alcazaba in Mérida, Extremadura, Spain.
Palatial Hedge - A hedge in the gardens of Blenheim Palace in Oxford, England.