From our smug (though extremely temporary) perch atop history, we can safely say that we know exactly where the U.S. city of Toledo is: It’s in Ohio, of course. But in the 1800s, the answer wasn’t so easy — and the resulting battle was incredibly bitter.

Lake Erie turned an eerie shade of green due to a toxic algae bloom, steering Toledo away from the taps. Someone putting razor blades in parking meters is making New Jersey residents wary. And 10 years later, poor Athens is still paying the price for hosting the Olympics. It's What's Ruining Our Cities.

This beautiful photo captured 50 photographers who'd set off their cameras' flashes over 3,000 times across a 100,000sq/m trail of the Spanish city Toledo, making one of the prettiest examples of lightpainting I've seen. [Caborian via Strobist]