Chattanooga, the fourth largest city in Tennessee, offers visitors and residents a scenic blend of mountains, lakes and rivers. It has the most affordable housing program in the nation, with a mix of both small neighborhoods and suburbs. The city has received several awards for its livability. With proximity to natural hotspots like Ruby Falls and Lookout Mountain, Chattanooga is also an ideal setting for outdoor adventure. The historic Tivoli Theatre provides a cultural complement to the city's many other assets, which includes the Tennessee Aquarium.