India, Aug. 22 -- A spaceship, a moving tank, a Rubik's cube, a sea snail's shell - these unusual libraries will wake up the adventure junkie hidden inside every bibliophile. By Smrithi Suresh 1. Sandro Penna Municipal Library - Perugia, Italy

This pink bubble-gum coloured three-storey disk is not an alien spaceship, but the Sandro Penna municipal library, named after a Perugian poet. Its unique architecture which includes the usage of rose-tinted glass walls allows sunlight to seep in during the day and creates a beautiful, warm glow at night. This library attracts not just bookworms but also tourists from across the planet. It houses almost 19,800 volumes and a variety of literature. 2. Biblioteca Vasconcelos - Mexico City, Mexico

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