The Alexander Nevsky Cathedral in Sofia, Bulgaria, stands as a monumental example of Neo-Byzantine architecture and is one of the largest Eastern Orthodox cathedrals in the world. Visitors can explore its stunning interiors adorned with intricate mosaics and frescoes, admire the impressive golden domes from the outside, and learn about its historical significance at the crypt museum housing a vast collection of Orthodox icons. The cathedral's surrounding area offers a chance to enjoy local cafes, stroll through nearby parks, and experience the cultural richness of Sofia.