National Aquarium - Inspires people to enjoy, respect, and protect the aquatic world. Several fascinating exhibits of the most interesting and beautiful creatures found in the water.
Union Station - For over 90 years, Union Station has welcomed people to the most important city in the world. This magnificent building has even played host to 17 Presidents and countless foreign dignitaries. However, what may be most impressive is the fact that Union Station's marble floors echo with the footsteps of over 23.4 million people each year, making it the most visited site in all of Washington.
Washington National Cathedral - The Cathedral towers above the city from its 57-acre site high on Mt. St. Alban. Sixth largest cathedral in the world, burial sites of President Woodrow Wilson, Hellen Keller, and her two teachers. War Memorial and Children's Chapels, Space Window with moon rock inset. Observation Gallery offers magnificent views of Washington, Virginia, and Maryland.
United States National Arboretum - The Arboretum's beautiful 446-acre campus in Washington, D.C. contains an array of display gardens, collections, and historical monuments set among native stands of eastern deciduous trees.
The Old Post Office Pavilion - Located on Pennsylvania Avenue and 12th Streets, NW, halfway between the White House and the United States Capitol. It is Washington, D.C.'s first modern skyscraper standing an impressive 12 stories tall. The building was originally built to house the United States Post Office Department and the Washington, D.C. Post Office.