romanesque arches of the trier imperial palace

trier imperial palace romanesque architecture arched porticoes german landmarks historical stonework detailing cultural heritage medieval history tourist attraction in germany palatial arches architectural beauty overcast sky preservation public monument site patterns sandstone walls traditional renovation european roman empire ancient fortress pillars destination educational travel timeless construction grandeur fortified structure rhinelandpalatinate germanic classical influence touristic education exploration europe tourism cloisterlike archeological landmark photography masonry techniques gallery revival monuments symmetry