My HRC T-shirt/shirt collection (includes now defunct locations):

Edmonton
Vancouver
Toronto Skydome
Houston
Las Vegas
Hollywood
Honolulu
San Diego
Washington, DC
New York
New Orleans
Kona
Cancun
Puerto Vallarta
Edinburgh
Berlin
Munich
Amsterdam
Madrid
Rome
London
Mykonos
Hong Kong
Tokyo
Kuala Lumpur
Sydney
Singapore
Cairo

My fave is a midnight blue Honolulu T with a fairly plain front but on the back a guitar surrounded with white flames and the "Pray For Surf" motto around the edge. ^

I see Bucharest is getting one in June, which is a few months before I arrive on my cheap NW tkt. ^ I'm also stopping for 8 hours in Houston, so will probably get into the Houston HRC and get another shirt rather than sit at the airport.