The toads' destination: their birthplace in the Roxborough Reservoir, which once provided drinking water to Philadelphians and is now preserved as open space in the city's park system.

WSJ: Why Do the Toads Cross the Road? It's Mating Season in Philadelphia

In August 2012, an excavation began in a city council car park - the only open space remaining in the likely area - which quickly identified buildings connected to the church.

BBC: Richard III dig: DNA confirms bones are king's

The city is vast and dense, and the areas that are most popular are ones with a human scale or with open, green space, which is a premium in the city.

BBC: Living in: Shanghai

As part of the revamp, Market Square will become completely pedestrianised to create "a large, car-free, open space which can be used for events to draw people to the city, " a council spokesman said.

BBC: Salisbury Market Place

Tudor City's 10 buildings between East 40th and East 43rd streets have 3, 000 apartments and landscaped open space.

WSJ: Selling Tudor City Treasure

And Taubman will help develop 500, 000 square feet of retail space at MGM Mirage's City Center casino on the Las Vegas Strip, slated to open in 2009.

FORBES: Shopping For Bargains