Try to find a map, or guide sheet, that offers the area's landmarks. In cities this would likely include major fountains, famous buildings, and statues. In a state park or other wilderness setting it would show geographical features that stand out, markers that have been added to trails, and rangers' towers.
If the landmarks are given on a map, take the map with you. If they are on a guide sheet, add them to your map before setting out.
As you travel make sure you are looking for the landmarks that you have selected from the map or guide sheet. Being familiar with what they actually look like is essential, and locating them helps you to become more comfortable with your map.
Be observant, and mark further landmarks on your map. A good landmark should be visible from multiple directions, large, permanent, and obviously distinct. These landmarks could include: churches, old buildings/ ruins, milestones or man-made trail markers, features of rivers or streams like an unusual bend or water fall, unusual rock formations or coloring, large trees with an unusual shape, or large clearings that have specific plants growing in them.
Look for, and mark, new landmarks frequently. There should be no more than 10 to 15 minutes walking distance between one landmark on your map and the next. The longer you intend to hike the more important landmarks become, and the more of them you should mark. These can be used if you get lost to back track to a more familiar position. They can also be used in conjunction with a compass to figure your exact location.