Every evening from March to October, 1.5 million Mexican free-tailed bats emerge from under the Congress Avenue Bridge in a dark, swirling cloud that takes your breath away. It's one of the largest urban bat colonies in the world, and watching them stream out against a sunset sky is the most Austin thing you can do that costs nothing.
Insider tip
Stand on the southeast side of the bridge, facing east, about 20 minutes before sunset. The bats fly east.
More in Austin



