I live there, and have for all of my life (if you would call it that).

It's a Washington DC suburb, just northwest of the Maryland-DC border in Montgomery County, Maryland. It's also the home of NIH. For those two reasons it has been featured on The X-Files a few times. Juan Miguel Gonzalez stayed there breifly.

It was named after a Biblical town in Israel also called "Bethesda" (spelled a little differently I think) where a few of Christ's apostles were from.

It is a pretty wealthy area, lately with a lot of development. Ever since they built that Barnes & Noble I've been finding I'm liking it less.