On at least this one point, believers and atheists can likely agree: many of the world's sacred structures are truly works of architectural beauty.

From Turkey's Hagia Sophia to Poland's Wawel Catherdral to St. Peter's in Vatican City, the historical devotion to religion is demonstrated in the beautiful cathedrals and basilicas found throughout the globe. Though several of the oldest structures are now secular, many still operate as houses of worship and typically rank among their home city's best architectural treasures.

Here's a look at 13 of the world's most stunning cathedrals and basilicas. And be sure to tell us which ones you feel were overlooked in the comments.

PHOTO GALLERY World's Most Stunning Cathedrals & Basilicas