All those years living in Pittsburgh and I've never been to Frank Lloyd Wright's Falling Water. I think a trip should be made in the upcoming warmer months. From Wikipedia: Fallingwater, also known as the Edgar J. Kaufmann Sr. Residence, is a house designed by American architect Frank Lloyd Wright in 1935 in rural southwestern Pennsylvania, 50 miles southeast of Pittsburgh, and is part of the Pittsburgh Metro Area. The house was built partly over a waterfall in Bear Run at Rural Route 1 in the Mill Run section of Stewart Township, Fayette County, Pennsylvania, in the Laurel Highlands of the Allegheny Mountains.
Hailed by TIME magazine shortly after its completion as Wright's "most beautiful job," the home inspired Ayn Rand's novel The Fountainhead, and is listed among Smithsonian magazine's Life List of 28 places "to visit before ...it's too late." Fallingwater was featured in Bob Vila's A&E Network production, Guide to Historic Homes of America."

While on the topic, how fun is it to look at modern design and waterfalls. I can look at prefab modern houses for days on Flickr....
Spring is pretty much here and Summer is right around the block...some waterfalls to get you siked for it.