These are some so-called tiny planet (or little planet) photos of Washington DC’s landmarks. They’re real photos—not generated graphics. They start as a 360-degree spherical image and then use software that ramps up the ultra-fish-eye distortion.
Basically, these start with an equirectangular photo that’s used for a 360-degree spherical panorama. They’re then processed using software that can manipulate the distortion.
I have more about how they’re made here.
If you're coming in from out of town, here are some of the most popular guidebooks that can help you make the most of your visit.
And here are some interesting options for less traditional guidesbooks if you'd like an emphasis on exploring DC on foot or diving into some of the region's rich history.