We arrived an hour before closing on a weekday.
You have to ring the bell to enter and you are greeted by a docent. Our guide was dressed in period costume, but not all are.
Admission as of Nov 2012 was $5/adults, $3/kids 6 and up.
The first thing you are told is that you can't touch anything or take any photos inside the house (not even without flash). Obviously, this is a pain if you're visiting with little kids, or happen to be a photography hound...but it also isn't completely unexpected.
The tour is room to room, basement to 2nd floor, with interesting things pointed out throughout. There is only one piece of furniture that actually belonged to WHH, as well as a few dishes and everyday items. Most of the house contains "period" items as opposed to personal belongings of WHH. There is a spot where a bullet was rumored to have been shot into the house, and parts of the house are built to be a fort.
The most amazing part is that the house was built in 1802....fell into disrepair to the point that it was a barn at one point...and then was purchased by the DAR and turned into a museum in 1911. It's amazing to think that this building is over 200 years old, but has been a museum for over 100 years!
I would recommend this to anyone visiting the area. Very interesting and affordable. Obviously, all docents are different, but it might be worth it to call ahead and ask if there is one with experience with children. Our guide was understanding considering we had 4 children with us....but she made no attempt to alter her memorized speech to help inform our elementary school aged kids....and only looked at the adults when she spoke. Each room does have a "fence" that allows you to walk slightly inside the room, but prevents touching...however the halls have furniture and there are lots of things that invite small children to climb up or sit down!
NOTE: there are a few period buildings on the property, and some grounds that are perfect for running around or enjoying a picnic. Also, because of the age of the house, this location is NOT handicapped accessible.
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