In less than an hour's drive from D.C. -- well, depending on traffic -- you can step high atop the tallest (Pentagonal-shaped) building in world and visit the Top of the World lookout (401 E. Pratt St., Baltimore).
We're still wondering who's going to build the world's tallest triangle-shaped building, but that's a topic for another day.
The lookout is located on the 27th floor of Baltimore's World Trade Center building -- and on Dec. 3 and 4, you can in for just a buck.
For your $1 investment, you'll get a 360-degree view of the Baltimore skyline, a guided tour, exhibits and stationed binoculars. View the Inner Harbor, the surrounding city and all the way to the Chesapeake Day.
After you're done checking out Charm City's seascape from above, you can visit the new 9/11 Maryland Memorial exhibit, which honors the lives of Maryland victims of the attacks. Artifacts from the Twin Towers, Pentagon and Flight 93 are on display through Dec. 31.
Hours of operation for the lookout vary by month, so be sure to plan accordingly. Ticket pricing is usually $5 adults and $3 for children age 3-12.
Top of the World is also on Baltimore's Harbor Pass (a four-day admission pass to four of Baltimore's most popular attractions).
Parking is available at Harbor Park Garage, for directions (see directions here).