When visitors come to the Washington, DC, area I like to have an off-the-beaten-path option for them. Something that most people would just walk or drive by and not notice. One of these options used to be the Einstein Statue, but recently they’ve redone the landscaping so it’s much harder to miss as you drive down Constitution Avenue.
It turns out that there is a “secret” underground “lair” in DC that you can enter and feel almost like you’re in a James Bond movie. In the photo, below, note the inconspicuous little building between the Smithsonian Castle (on the left) and the Freer Gallery (on the right). Looks like a visitor’s welcome center or something, right?