Despite Netflix's best attempts, finding something perfect to watch isn't always easy. The company uses your history to make the best suggestions possible, but they're also hiding a detailed list of sub-categories and genres that you couldn't purposefully browse until now... if you have the codes.

Visit this URL (must be logged in) and replace the XXX with the correct code:
http://www.netflix.com/browse/genre/XXXX

List of codes:
Action & Adventure: 1365
Action Comedies: 43040
Action Sci-Fi & Fantasy: 1568
Action Thrillers: 43048
Adult Animation: 11881
Adventures: 7442
African Movies: 3761
Alien Sci-Fi: 3327
Animal Tales: 5507
Anime: 7424
Anime Action: 2653
Anime Comedies: 9302
Anime Dramas: 452
Anime Fantasy: 11146
Anime Features: 3063
Anime Horror: 10695
Anime Sci-Fi: 2729
Anime Series: 6721
Art House Movies: 29764
Asian Action Movies: 77232
Australian Movies: 5230
B-Horror Movies: 8195
Baseball Movies: 12339
Basketball Movies: 12762
Belgian Movies: 262
Biographical Documentaries: 3652
Biographical Dramas: 3179
Boxing Movies: 12443
British Movies: 10757
British TV Shows: 52117
Campy Movies: 1252
Children & Family Movies: 783
Chinese Movies: 3960
Classic Action & Adventure: 46576
Classic Comedies: 31694
Classic Dramas: 29809
Classic Foreign Movies: 32473
Classic Movies: 31574
Classic Musicals: 32392
Classic Romantic Movies: 31273
Classic Sci-Fi & Fantasy: 47147
Classic Thrillers: 46588
Classic TV Shows: 46553
Classic War Movies: 48744
Classic Westerns: 47465
Comedies: 6548
Comic Book and Superhero Movies: 10118
Country & Western/Folk: 1105
Courtroom Dramas: 528582748
Creature Features: 6895
Crime Action & Adventure: 9584
Crime Documentaries: 9875
Crime Dramas: 6889
Crime Thrillers: 10499
Crime TV Shows: 26146
Cult Comedies: 9434
Cult Horror Movies: 10944
Cult Movies: 7627
Cult Sci-Fi & Fantasy: 4734
Cult TV Shows: 74652
Dark Comedies: 869
Deep Sea Horror Movies: 45028
Disney: 67673
Disney Musicals: 59433
Documentaries: 6839
Dramas: 5763
Dramas based on Books: 4961
Dramas based on real life: 3653
Dutch Movies: 10606
Eastern European Movies: 5254
Education for Kids: 10659
Epics: 52858
Experimental Movies: 11079
Faith & Spirituality: 26835
Faith & Spirituality Movies: 52804
Family Features: 51056
Fantasy Movies: 9744
Film Noir: 7687
Food & Travel TV: 72436
Football Movies: 12803
Foreign Action & Adventure: 11828
Foreign Comedies: 4426
Foreign Documentaries: 5161
Foreign Dramas: 2150
Foreign Gay & Lesbian Movies: 8243
Foreign Horror Movies: 8654
Foreign Movies: 7462
Foreign Sci-Fi & Fantasy: 6485
Foreign Thrillers: 10306
French Movies: 58807
Gangster Movies: 31851
Gay & Lesbian Dramas: 500
German Movies: 58886
Greek Movies: 61115
Historical Documentaries: 5349
Horror Comedy: 89585
Horror Movies: 8711
Independent Action & Adventure: 11804
Independent Comedies: 4195
Independent Dramas: 384
Independent Movies: 7077
Independent Thrillers: 3269
Indian Movies: 10463
Irish Movies: 58750
Italian Movies: 8221
Japanese Movies: 10398
Jazz & Easy Listening: 10271
Kids Faith & Spirituality: 751423
Kids Music: 52843
Kids’ TV: 27346
Korean Movies: 5685
Korean TV Shows: 67879
Late Night Comedies: 1402
Latin American Movies: 1613
Latin Music: 10741
Martial Arts Movies: 8985
Martial Arts, Boxing & Wrestling: 6695
Middle Eastern Movies: 5875
Military Action & Adventure: 2125
Military Documentaries: 4006
Military Dramas: 11
Military TV Shows: 25804
Miniseries: 4814
Mockumentaries: 26
Monster Movies: 947
Movies based on children’s books: 10056
Movies for ages 0 to 2: 6796
Movies for ages 2 to 4: 6218
Movies for ages 5 to 7: 5455
Movies for ages 8 to 10: 561
Movies for ages 11 to 12: 6962
Music & Concert Documentaries: 90361
Music: 1701
Musicals: 13335
Mysteries: 9994
New Zealand Movies: 63782
Period Pieces: 12123
Political Comedies: 2700
Political Documentaries: 7018
Political Dramas: 6616
Political Thrillers: 10504
Psychological Thrillers: 5505
Quirky Romance: 36103
Reality TV: 9833
Religious Documentaries: 10005
Rock & Pop Concerts: 3278
Romantic Comedies: 5475
Romantic Dramas: 1255
Romantic Favorites: 502675
Romantic Foreign Movies: 7153
Romantic Independent Movies: 9916
Romantic Movies: 8883
Russian: 11567
Satanic Stories: 6998
Satires: 4922
Scandinavian Movies: 9292
Sci-Fi & Fantasy: 1492
Sci-Fi Adventure: 6926
Sci-Fi Dramas: 3916
Sci-Fi Horror Movies: 1694
Sci-Fi Thrillers: 11014
Science & Nature Documentaries: 2595
Science & Nature TV: 52780
Screwball Comedies: 9702
Showbiz Dramas: 5012
Showbiz Musicals: 13573
Silent Movies: 53310
Slapstick Comedies: 10256
Slasher and Serial Killer Movies: 8646
Soccer Movies: 12549
Social & Cultural Documentaries: 3675
Social Issue Dramas: 3947
Southeast Asian Movies: 9196
Spanish Movies: 58741
Spiritual Documentaries: 2760
Sports & Fitness: 9327
Sports Comedies: 5286
Sports Documentaries: 180
Sports Dramas: 7243
Sports Movies: 4370
Spy Action & Adventure: 10702
Spy Thrillers: 9147
Stage Musicals: 55774
Stand-up Comedy: 11559
Steamy Romantic Movies: 35800
Steamy Thrillers: 972
Supernatural Horror Movies: 42023
Supernatural Thrillers: 11140
Tearjerkers: 6384
Teen Comedies: 3519
Teen Dramas: 9299
Teen Screams: 52147
Teen TV Shows: 60951
Thrillers: 8933
Travel & Adventure Documentaries: 1159
TV Action & Adventure: 10673
TV Cartoons: 11177
TV Comedies: 10375
TV Documentaries: 10105
TV Dramas: 11714
TV Horror: 83059
TV Mysteries: 4366
TV Sci-Fi & Fantasy: 1372
TV Shows: 83
Urban & Dance Concerts: 9472
Vampire Horror Movies: 75804
Werewolf Horror Movies: 75930
Westerns: 7700
World Music Concerts: 2856
Zombie Horror Movies: 75405