Vitor Costa Photography
Vitor Costa Architecture Photography
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![The Willis Tower, built as and still commonly referred to as Sears Tower, is a 108-story, 1,451-foot (442 m) skyscraper in Chicago, Illinois, United States.[2] At completion in 1973, it surpassed the World Trade Center towers in New York to become the tallest building in the world, a title it held for nearly 25 years. The Willis Tower is the second-tallest building in the United States and the 12th-tallest in the world. More than one million people visit its observation deck each year, making it one of Chicago's most popular tourist destinations. The structure was renamed in 2009 by the Willis Group as part of its lease on a portion of the tower's space.](https://photos.smugmug.com/Architecture/Chicago/i-S9ZSLRB/0/M/20141024-_MG_7232-M.jpg)
![Ann W. Richards Congress Avenue Bridge is home to the world's largest urban bat colony which is composed of Mexican free-tailed bats. The bats reside beneath the road deck in gaps between the concrete component structures. They are migratory, spending their summers in Austin and the winters in Mexico. According to Bat Conservation International,[3] between 750,000 and 1.5 million bats reside underneath the bridge each summer. Since Austin's human population is about 750,000, there are more bats than people in Austin during summer.
The nightly emergence of the bats from underneath the bridge at dusk, and their flight across Lady Bird Lake primarily to the east, to feed themselves, attracts as many as 100,000 tourists annually.[3] Tourists can see the bats from the bridge, from the sides of the river and from boats.
A study made in 1999 by Dr. Gail R. Ryser and Roxana Popovici concludes that the economic impact of the bats to Austin city is $7.9 million each year. Today, businesses are using the bats as a symbol for Austin.](https://photos.smugmug.com/Architecture/Texas/i-k7VDqqt/0/S/20121023-_MG_6480-S.jpg)
