Naval Observatory, Washington

Settled on the hilly lawns of a naval fort in upper northwest Washington, the Observatory measures the times and positions of the stars. Visitors may watch a short movie and view the precision clocks and high-powered telescope. Though it is not generally open to the public, visitors can catch a glimpse of its fine Victorian exterior. Tours are held on select days. Up to 90 people are admitted per tour and prior reservations need to be made either through their website or fax.