Basilica

: Free entry, unparalleled historical and artistic significance, stunning architecture.

Famous for its glittering gold mosaics and Byzantine influence. Visitors recommend booking tickets in advance to skip the heavy Piazza San Marco crowds. Notable U.S. Basilicas basilica

Basilica of the National Shrine of the Immaculate Conception ClosedWashington, DC Notable U

“It's an art lover's paradise inside; the art will overpower you wherever you look.” Yelp Cathedral Basilica of the Sacred Heart Catholic cathedral

The largest Catholic church in North America. Reviewers on Yelp love the diverse "national" chapels but note its opulent style can feel "gaudy" to some. Cathedral Basilica of the Sacred Heart Catholic cathedral ClosedNewark, NJ

Gaudí's unfinished masterpiece is praised for its unique "tree-trunk" columns and forest-like interior. Saint Mark's Basilica ClosedVenice, Metropolitan City of Venice, Italy

: Massive crowds, strict dress code (shoulders and knees covered), and narrow, steep stairs for the dome climb. Basílica de la Sagrada Família ClosedBarcelona, Spain