Henry Grabar

ThankYouLondon

Gratitude Map of the Day: Thank You London

Something to be thankful for, from Mitcham to Highgate Hill.

4StrikeBike

The Bike You Pedal With Both Arms and Legs

Put all your limbs to use.

Seth Wenig/Reuters

How Gross Is the Air of the NYC Subway, Really?

The results of a microbial analysis.

Horrifying Urban 'Surprise' of the Day: A Fiery Hole in a London Sidewalk

Whoa! Heads up!

Reuters

When It Comes to Flood Prevention, Not All Grass Is Created Equal

Some species are much more absorbent than others, according to new research.

George W. Bush Center

An Architectural Reflection of George W. Bush

The Bush Presidential Center will include a library, museum, and think tank.

Shutterstock/Yuri Arcurs

Potentially Creepy Airline Perk of the Day: Flirty Drinks

Virgin America's plan to get customers chatting.

AmitP/Flickr

Weirdly Catchy Song of the Day: The National Park Week Jingle

If you don't know, now you know.

Flickr/Michaelina2

Everything You Need to Know About Why Chicago Is Furious With Rachel Shteir and The New York Times

An old-fashioned battle over civic character.

Creative Skyscraper Use of the Day: A Giant Game of Pong

The world's largest game of pong, played on Philadelphia Cira Center's massive glass facade.

Reuters

How Much Will the Boston Lockdown Cost?

The estimates at this early stage vary widely.

Reuters

Boston Is One of the Best Prepared U.S. Cities to Handle a Crisis

The city conducted vivid, citywide disaster simulations in 2011 and 2012.

Shutterstock

Public Health Initiative of the Day: No Salt For You

Mexico City's "Menos sal, más salud" encourages restaurant owners to make salt shakers available only for those who request them.

Suzanne Plunkett/Reuters

The London Marathon Will Go On This Weekend, Organizers Say

Race officials are reviewing security precautions with local police after the attacks in Boston Monday.

Associated Press

'America Will Say a Prayer for Boston Tonight'

Apparent terror attacks at the finish line of the Boston Marathon.

Reuters/Ahmed Jadallah

Dubai to World: Forget Our Debt Crisis, Look at This Shiny Car

Lamborghini logic.

Shutterstock

DIY Urbanism of the Day: How Many Drivers in Your Nabe Aren't Signaling?

And are they better or worse than the national average?

Laurent Chehere

Here's What It Would Look Like If Paris's Houses Could Fly

An artist reimagines the city's homes against the sky.

Copyright Claude Truong-Ngoc / Wikimedia Commons

Could Paris End Up With a Metro Station Named After Serge Gainsbourg?

The system's expansion means plenty of jockeying to name the city's newest points of reference.