The Forgotten Mario Kart Tracks

Ever since Mario Kart DS introduced the concept of bringing back courses from previous entries, there's been constant discussion between fans over which ones should/shouldn't/are going to see a second life in the newest entry. This leads to the obvious question of "Given how many tracks have been given a second go around, what are the tracks that have never returned?". Join me as we go over the 22 Mario Kart race tracks that have been forgotten to time.

Video Footage Sources
Project Longplay -    • Mario Kart: Double Dash!! - Longplay ...  
aWiibo (DS) -    • Mario Kart DS HD - All Courses 150cc ...  
aWiibo (Tour) -    • Mario Kart Tour - Piranha Plant Pipel...  
ModernXP -    • Mario Kart 7 - Full Game 100% Longpla...  

Timestamps
00:00 - Intro
01:13 - SNES Bowser Castle 1
02:49 - SNES Bowser Castle 2
04:04 - SNES Koopa Beach 1
05:31 - SNES Mario Circuit 4
07:08 - SNES Ghost Valley 3
09:21 - N64 Wario Stadium
11:14 - GBA Broken Pier
12:52 - GBA Rainbow Road
14:52 - GCN Mushroom City
16:03 - GCN Wario Colosseum
17:51 - GCN Bowser's Castle
19:49 - GCN Rainbow Road
20:55 - DS Figure-8 Circuit
22:00 - DS Bowser Castle
23:08 - DS Rainbow Road
24:40 - Wii Luigi Circuit
26:23 - Wii Toad's Factory
28:12 - Wii Mario Circuit
29:52 - Wii Bowser's Castle
31:30 - 3DS Wuhu Loop [Wuhu Island Loop]
33:38 - 3DS Maka Wuhu [Wuhu Mountain Loop]
35:27 - Tour Piranha Plant Pipeline
37:47 - Outro