In the market to purchase a home? One great way to remember what a home you toured looks like, after you have seen dozens is to take photos. Be organized in how you take the photos, perhaps always taking a full on photo of the house first, then taking them as you tour the home. This way you will have a record of each home, can delete those you are not interested and save trips back to visit later.
Just a reminder, you will need to ask for permission from the seller or Realtor BEFORE you photograph the inside. It will be worth it to have this powerful memory aid.