London has been home to a cathedral dedicated to St. Paul for more than 1,400 years. Here is its fourth incarnation, designed by Sir Christopher Wren and built in the late 17th century. Though it is technically a Christian church, replete with services, the cathedral is a huge attraction for any lover of architecture or design. From the crypt (where the Duke of Wellington is buried) to the gorgeous nave and quire sections of the cathedral, it is something to see. Its dome is over 100 meters tall (one of the largest in the world), weighing 65,000 tons, and famously withstood the blitz in World War II. As you wander, don’t forget to look up; some of the most stunning sights are high above you.