Determining the best architecture in the world is subjective and can vary based on criteria such as historical significance, aesthetic beauty, cultural impact, and innovation. However, several architectural marvels are frequently highlighted for their exceptional design and influence. Here are some renowned examples:

### Historical Marvels

1. **The Great Wall of China (China)**:
   - A symbol of ancient engineering, this extensive fortification stretches over 13,000 miles and showcases various architectural styles from different dynasties.

2. **The Pyramids of Giza (Egypt)**:
   - These ancient structures, particularly the Great Pyramid, are celebrated for their monumental scale and precise construction.

Determining the best architecture in the world is subjective and can vary based on criteria such as historical significance, aesthetic beauty, cultural impact, and innovation. However, several architectural marvels are frequently highlighted for their exceptional design and influence. Here are some renowned examples:

### Historical Marvels

1. **The Great Wall of China (China)**:
   - A symbol of ancient engineering, this extensive fortification stretches over 13,000 miles and showcases various architectural styles from different dynasties.

2. **The Pyramids of Giza (Egypt)**:
   - These ancient structures, particularly the Great Pyramid, are celebrated for their monumental scale and precise construction.

3. **Machu Picchu (Peru)**:
   - An iconic Incan city set high in the Andes Mountains, renowned for its sophisticated dry-stone construction and breathtaking setting.

4. **Taj Mahal (India)**:
   - A masterpiece of Mughal architecture, this white marble mausoleum is famed for its symmetry, intricate inlay work, and stunning gardens.

### Modern Wonders

1. **Eiffel Tower (France)**:
   - A global cultural icon of France and an architectural feat of its time, showcasing wrought iron lattice work.

2. **Burj Khalifa (UAE)**:
   - The tallest building in the world, standing at 828 meters, exemplifying cutting-edge design and engineering.

3. **Sydney Opera House (Australia)**:
   - Famous for its unique, sail-like design, it is a paragon of modernist architecture and a UNESCO World Heritage site.

4. **Guggenheim Museum Bilbao (Spain)**:
   - Designed by Frank Gehry, this museum is celebrated for its innovative use of materials and sculptural form.

### Contemporary Innovations

1. **The Shard (UK)**:
   - A striking, glass-clad pyramidal tower in London, designed by Renzo Piano, known for its sustainable design features.

2. **Louvre Abu Dhabi (UAE)**:
   - Designed by Jean Nouvel, this museum is noted for its unique dome structure that creates a 'rain of light' effect.

3. **Marina Bay Sands (Singapore)**:
   - An integrated resort featuring three towers connected by a sky park, it is an example of modern engineering and luxurious design.

4. **Harbin Opera House (China)**:
   - Designed by MAD Architects, this building is noted for its fluid form and integration with the surrounding landscape.

### Notable Architects

1. **Frank Lloyd Wright**:
   - Known for his philosophy of organic architecture and famous works like Fallingwater and the Guggenheim Museum in New York. 

2. **Le Corbusier**:
   - A pioneer of modern architecture, known for buildings like Villa Savoye and the design of Chandigarh.

3. **Zaha Hadid**:
   - Renowned for her futuristic designs and use of curvilinear forms, seen in buildings like the Heydar Aliyev Center and the Guangzhou Opera House.

4. **Norman Foster**:
   - Known for his high-tech architecture, including buildings like the Gherkin in London and the Reichstag Dome in Berlin. 

These examples highlight a range of architectural styles and achievements across different eras and cultures, illustrating the diversity and ingenuity of architectural design worldwide.