[JRios1968]

But; how do you get into a B-2? Climb a ladder and walk across the wing to the cockpit?

Nope, there's a hatch under the left side by the nose landing gear with a retractable ladder attached.

[JRios1968]

And from looking at the source picture (much larger version here,) this one is the one that crashed in Guam, 89-0127 The Spirit of Kansas.