Explore the allure of cool, moody indigo—the color between blue and violet—as seen in these incredible pictures of cities and architecture around the world.

Kioto station by Alejandro Santiago on 500px

Utopia by Alejandro Santiago on 500px

Window by Alejandro Santiago on 500px

27102008 Marruecos - 70 by Alejandro Santiago on 500px

Blue Window by Alejandro Santiago on 500px

Cobalt street by Alejandro Santiago on 500px

Blues by Alejandro Santiago on 500px

Geometry by Alejandro Santiago on 500px

Lunenburg Blue by Alejandro Santiago on 500px

Blue & White ,HK by Alejandro Santiago on 500px

Window in Portugal by Alejandro Santiago on 500px

Blue City by Alejandro Santiago on 500px

The blue boats of Essaouira by Alejandro Santiago on 500px

Arms of Clashed Striations by Alejandro Santiago on 500px

blue by Alejandro Santiago on 500px

SPACE WARP by Alejandro Santiago on 500px

The Squareness by Alejandro Santiago on 500px

blue by Alejandro Santiago on 500px

Feeling Blue. by Alejandro Santiago on 500px

Blue Velvet by Alejandro Santiago on 500px

blue glass by Alejandro Santiago on 500px

Photographing Downtown Dallas by Alejandro Santiago on 500px

Blue Mosque from Hagia Sophia by Alejandro Santiago on 500px

Looking for more colorful inspiration? Check out our stories on great examples of the colors red and orange here on 500px ISO:
19 Bold, Bright Red Photo + Quotes That Caught Our Attention
These 32 Perfect Photos Prove Orange Is The Coolest Color
30 Peppy Photos That Portray The Color Yellow In Food
31 Ways The Color Green Can Make Your Photos Stand Out
33 Ethereal Photos That Capture The Color Blue