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 B&O Railroad Museum, the National Building Museum in Baltimore, and Frank Lloyd Wright's Pope-Leighey House in Alexandria, soaking up knowledge along the way. Gather up friends and family and sojourn over to the National Historic Landmark Headquarters in Dupont Circle or other Trust locations in the area, including Abraham Lincoln's cottage, the Woodrow Wilson House, and Decatur House.

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.

Reviews

While there aren't any online reviews for the National Trust for Historic Preservation, many members wrote letters to the editor of the Trust's magazine Preservation, commenting on their memberships. The National Trust for Historic Preservation has more than 18,000 Facebook fans.

• We've been NTHP members for a few years now and I just wanted to…express how much I look forward to the Preservation  magazine showing up monthly. I enjoy reading it from cover to cover and discovering how NTHP is promoting the saving of our architectural heritage. – Michael B.