4K HD Wallpaper: Skyscraper from Toronto
New super architecture photography took in Toronto by Patrick Tomasso and shared from his courtesy under CC0 license. Personally, this skyscraper image I like to use in homescreen phone, but as usually it's optimized for fit in desktop backgrounds, blog articles, apps, social media, webdesign projects...
Widescreen Desktop / Macbook (Retina): 2880x1800 (fits on: 2560x1600, 1920x1200, 1440x900)
High Definition HD 1080p: 1920x1080 (fits on: 1600x900, 1366x768, 1280x720)
Samsung Galaxy Tab & iPad: 2048x2048 (compatible with many tablets)
HTC, Samsung Galaxy & iPhone: 1080x1920 (compatible with many phones)