Celebrate Juneteenth, stay up late at the Smithsonian’s Solstice Saturday, dance at an outdoor concert or sample barbecue on Pennsylvania Avenue.

trees and butterflies’ — the country has more species of birds and plants than Canada and the US combined. Hidden among the capital’s skyscrapers are wildlife-rich parks — tropical forests ...

For a blast-from-the-past experience, you can check out a heritage railroad. Some reader recommendations include the East ...