The eastern seaboard metropolises of the United States offer plenty of possibilities for travellers in almost any budget range. Taken as a group, you can easily do a train trip starting in New York and ending in Washington DC, or vice versa. The trip outlined below could be done in as little as a week to 10 days, but ideally  a full two weeks would be the best time-frame to see everything comfortably.

New York

Museum of Modern Art, Metropolitan Museum of Art, Guggenheim Museum, Brooklyn Bridge (Grimaldi’s pizzeria), Central Park, Empire State Building, Rockefeller Centre, Radio City Music Hall, the United Nations, Grand Central Terminal

Philadelphia

Museum of Fine Art, Barnes Institute, Independence Hall, Liberty Bell, Independence Visitor Center, Old City Hall, Benjamin Franklin Museum, Independence Seaport Museum, USS New Jersey, USS Olympia

Baltimore

Fort McHenry, Civil War Museum, Baltimore Museum of Industry, Bromo Seltzer Arts Tower, Oriole Park at Camden Yards, National Aquarium, USS Constellation, USS Torsk

Washington

White House Visitor Center, Spy Museum, National Building Museum, National Cathedral, Ford’s Theatre, Renwick Gallery of the Smithsonian American Art Museum
Smithsonian Museums: Arlington National Cemetery, Smithsonian National Air and Space Museum, Smithsonian National Museum of American History, Smithsonian National Museum of Natural History, Smithsonian Castle, Arts and Industries Building,
National Mall: Lincoln Memorial, Thomas Jefferson Memorial, Washington Monument, World War II Memorial, Martin Luther King, Jr. Memorial
Smithsonian Aerospace Museum