Today's Groupon gets you half off membership to the National Trust for Historic Preservation. Choose between two options:

• For $10, you get an individual one-year membership (a $20 value).
• For $15, you get a family one-year membership (a $30 value).

A non-profit organization devoted to protecting and preserving America's historic locales, the National Trust for Historic Preservation grants its members free or discounted access to storied homes, museums, hotels, and more. Traipse across our nation's timeline, stopping at significant sites such as the Thomas Cole National Historic Site in Catskill, the Alice Austen House Museum in Staten Island, and the Lower East Side Tenement Museum, soaking up knowledge along the way. Gather up friends and family and sojourn over to Lyndhurst mansion in Tarrytown or other Trust locations in the area.

Membership additionally paves the path toward special rates when booking online at affiliated Historic Hotels of America, a collection of more than 100 lore-laden lodgings throughout the country. Members also receive a one-year subscription to Preservation magazine, which features in-depth place profiles and historic home listings.