Machu Picchu is like this. If you take the 3 day hike up the mountain to get there, you see some pretty awesome ruins. I did this in the early 90's and I'm sure the routes / ability has changed by now, but it was really cool back then.
Angkor Wat is the main attraction but it also has interesting nearby ruins as well. Rent a motorbike and get lost on the farming backroads, google maps works pretty well.
I did the 3 day hike about 8 years ago and I remember the ruins along the way where spectacular mainly due to there being no crowds. Holds a special place in my heart.
Angkor Wat is the main attraction but it also has interesting nearby ruins as well. Rent a motorbike and get lost on the farming backroads, google maps works pretty well.