1. St. Peter's Basilica (Vatican City)

- Located in Vatican City, this Renaissance church is considered the epicenter of Roman Catholicism. Designed by legendary architects including Michelangelo and Bernini, it features the iconic dome, breathtaking interiors, and the awe-inspiring Pietà sculpture by Michelangelo. Visitors can also climb to the dome for a panoramic view of Rome.

2. Notre-Dame de Paris (Paris, France)

- A Gothic masterpiece built between the 12th and 14th centuries, Notre-Dame is famous for its rose windows, flying buttresses, and gargoyle statues. It has been a central symbol in French history, hosting coronations and literary inspiration. Although it is under restoration after the 2019 fire, its grandeur and cultural significance remain unmatched.

3. Sagrada Familia (Barcelona, Spain)

- Antoni Gaudí’s magnum opus is an unconventional basilica combining Gothic elements with Art Nouveau details. Started in 1882 and still under construction, its unique design includes intricate facades depicting biblical scenes and a stunning interior inspired by nature, with columns resembling a forest canopy.

4. Westminster Abbey (London, England)

- This UNESCO World Heritage Site has been the coronation church for British monarchs since 1066. Its Gothic architecture is complemented by an impressive collection of tombs and memorials for notable figures like Isaac Newton, Charles Darwin, and Geoffrey Chaucer. It’s also famously the venue for royal weddings.

5. Church of the Savior on Spilled Blood (St. Petersburg, Russia)

- Built in the 19th century to commemorate the assassination of Emperor Alexander II, this church features ornate mosaics covering its interiors and exteriors. Its vivid colors, intricate patterns, and onion-shaped domes make it a quintessential example of Russian Revival architecture.

6. St. Basil's Cathedral (Moscow, Russia)

- Situated in Red Square, this iconic church was commissioned by Ivan the Terrible in the 16th century. It’s known for its whimsical, candy-colored domes and unique architecture, symbolizing both Russia’s historical richness and religious heritage. Its design resembles a bonfire reaching toward the sky.

7. Duomo di Milano (Milan, Italy)

- This stunning Gothic cathedral took nearly six centuries to complete. With over 135 spires and 3,400 statues, it is one of the largest churches in the world. Visitors can explore the rooftop for a close view of the intricate carvings and sweeping views of Milan.

8. Hagia Sophia (Istanbul, Turkey)

- Originally built as a Christian basilica in the 6th century, Hagia Sophia became a mosque in 1453 and now serves as both a mosque and a museum. Its massive dome, mosaics, and blend of Byzantine and Islamic architecture make it a symbol of Istanbul’s cultural crossroads.

9. Mont Saint-Michel Abbey (France)

- This medieval abbey is located on a tidal island off the coast of Normandy. It’s a stunning architectural feat, with its spires rising dramatically above the surrounding landscape. The abbey has served as a pilgrimage site for centuries and offers breathtaking views of the tidal flats below.

10. La Madeleine (Paris, France)

- Modeled after a Roman temple, La Madeleine was completed in the 19th century and is dedicated to Mary Magdalene. Its neoclassical facade and grand Corinthian columns are complemented by a luxurious interior, with a celebrated pipe organ often used for concerts. It’s a unique take on a traditional church design.