using the google maps Engine

xrez.com/boston_giga.html

provide an huge view of Boston zoomable 'till very detailed views.

of course xrez.com/ offer other subjets/panorama

Very slow for me... I first got a timeout, then I saw something but then it turned black again... looks interesting though...

Oh yeah, I've been to that site. They have some amazing super high resolution photos and panoramas available.