Flooded crypt, Basilica of San Francesco, Ravenna, Italy

© Andrea Pucci/Getty Image

Divine depths. Flooded crypt, Basilica of San Francesco, Ravenna, Italy

In the Italian province of Ravenna lies the Basilica of San Francesco, recognised for its beauty and historical significance. This Romanesque church, originally built in 450 CE, features a sturdy square bell tower added in the 9th century, enhancing the basilica's exterior. Its design features three naves, divided by two rows of 12 columns each. Featured in today's image is the basilica's real showstopper: the basement crypt, or a burial chamber, is a stunning model of early religious design. Complete with vaulted ceilings that slope down into rows of stone columns, its floor is a work of art itself. It's inlaid with beautifully intricate mosaic tiles that have withstood the test of time.

Built on soft marshland, Ravenna faces ongoing structural challenges because the entire city is gradually sinking. This is particularly evident in the crypt, which now remains perpetually submerged under about a foot of water. But instead of battling the slow flood, Ravenna has embraced it, filling the pool with goldfish that glide between the ancient columns and above the submerged mosaics. Visitors here often toss coins into the water, likely wishing for good luck, making this crypt more of a wishing well than a burial site.