Here’s a list of places I’ve been to (I’ve not included places where I’ve done stop-overs):

Asia
Shenzhen, China
Bali, Indonesia
Cherating, Malaysia
Ipoh, Malaysia
Kuala Lumpur, Malaysia
Kuching, Malaysia
Malacca, Malaysia
Pulau Besar, Mersing, Malaysia
Trengganu, Malaysia
Hong Kong, SAR
Macau, SAR
Seoul, South Korea
Taipei, Taiwan
Bangkok, Thailand
Phuket, Thailand
Ho Chi Minh City, Vietnam
North America
Dallas, TX
Atlanta, GA
Washington, DC
New York City, NY
Boston, MA
Lawrence, KS
Kansas City, MO
Las Vegas, NV
Omaha, NE
San Antonio, TX

* I’ve been through a few other towns/cities while sitting on a train but I won’t count them

Oceania
Perth, Australia
Sydney, Australia