This historic landmark was built in 1899 and served as the main post office for the country. Saved from demolition it was renovated and reopened in 1983. Today, it provides a little of everything: office space for the National Arts and Humanities Endowments, shops and restaurants. Under the building's enormous atrium, visitors may browse, play a round of miniature golf and enjoy free concerts at noon. Do not miss a ride up the 315-foot clock tower for one of the most spectacular views of the city.
• Hours: 8a-11p M-Su, Apr-Aug, 10a-6p M-Su Sep-Mar