15 stunning photos of the world's most interesting cities

Lombard Street, San Francisco, California.

Eiffel Tower, Paris, Ile-de-France, France.

Hong Kong.

Siddhapur, Gujarat, India.

Wadi Dohan, Yemen.

Sevilla, Andalusia, Spain.

Valencia, Spain.

Dubai, United Arab Emirates.

Los Angeles, California, United States.

Seoul, South Korea.

Roma, Latium, Italy.

Hong Kong.

The Great Wall of China, Beijing, China.

Hong Kong.