Virtual Field Trips
When you can't make a trip somewhere for real, try developing a purposeful virtual field trip.

Create a Virtual Fieldtrip - http://alixpeshette.edublogs.org/2009/12/29/create-a-great-virtual-fieldtrip/

Here's a great list from the Utah Education Network: http://www.uen.org/tours/fieldtrips2.shtml Choose your content area.
Another list: http://www.techtrekers.com/virtualft.htm
Digital and Virtual Field Trips - http://eduscapes.com/tap/topic35.htm

Here are some great places to visit. Don't forget to give your students assignments and goals for truly getting something from the experience.

White House 101 (for Kids) - http://www.whitehouse.gov/about/white-house-101
Inside the White House @ nationalgeographic.com - http://www.nationalgeographic.com/features/96/whitehouse/whhome.html Sign in as President and begin making decisions.
Official White House site - http://www.whitehouse.gov

Examples of Virtual Tours and Electronic Field Trips for teaching history - http://www.thwt.org/virtualtours.htm?THEBIGDEALBOOK=634106499596618490