The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.