I know that this post is old, but i guess i can give a few.
From my 1 year of mapping i have so far worked on 7 maps, but 5/7 of those maps were scraped.
koth_hanger - Was going to be my first map to post on this site. I wanted to make this type of map when the frontline project was announced, this map did have displacements and height variation, but i forgot to transfer this map to my new PC.
cp_commandbase - Was going to be an ABC a/d map. It also used the frontline theme. This map was already gonna get scraped because of how flat and how there wasn't much height variation.
koth_airbase - Was maybe a better version of koth_hanger. This map was inspired when i was a Xbox Peasant at the time, i was also a fan of cod waw at how it handled it's multiplayer maps. Hanger was my most favorite map from waw and I wanted to take inspiration of that map to tf2 mapping. This was also gonna be my first map, but i ALSO forgot to transfer the map to my new PC. So i forgot about the map.
cp_hangerbase - A 2cp a/d map. ANOTHER hanger map, but this was my most favorite out of the 3 other hanger maps, it had its entire layout made with everything. But guess what, i forgot to transfer the map to my new PC.
cp_basetop - My first map, and it is 5cp. I hate this map now after learning more about tf2 mapping. I hated how flat, open, and no height variation the map had. I'm happy to remake the map, but its just... weird to me now.
tc_warcity - A territorial control map. I scraped this map even before i finished the first capture point, but i'm thinking about reviving the map for a different gamemode.
koth_waterbridge - Was going to be a koth map with a bridge on top of water as the point. I scraped the map before the layout of mid was complete because another map had the same layout.
cp_snowgra - A single stage 2cp a/d map im working on, this map was originally gonna be an 3cp a/d map, and the original name was desbas. But i shortened it to 2cp, and changed the theme from desert to snow. This map had 5 versions before settling on the final version.