723 Kentuck Rd., Chalk Hill. kentuckknob.com
Sure, Fallingwater is nice, but it gets pretty crowded, and crowds are bad now. For an alternative, check out Kentuck Knob, another house by Frank Lloyd Wright located just a few miles from its more famous cousin. In addition to its architecture, the house is notable for its abundance of sculptures and artifacts, including pieces by Claes Oldenberg and Andy Goldworthy, as well as a slab of the Berlin Wall.
Moraine State Park
225 Pleasant Valley Rd., Portersville. dcnr.pa.gov/StateParks
This state park gets its name from moraines, a type of glacial accumulation that covered the park's land during the last glacial period. Now you can take a Trail of Geology tour to see glacial deposits. There are also trails, a lake, a birdwatching deck, and other activities.
401 Meadowcroft Rd., Avella. heinzhistorycenter.org/meadowcroft
Did you know that the oldest known site of human habitation in North America is in Washington County? The Rockshelter campsite, and prehistoric tools found along with it, dates back 19,000 years. Take a tour of the area and learn more about a piece of Pennsylvania history.