The House of Sweden holds both the Embassy of Sweden and the Embassy of Iceland and we regrettably left it off of our map of architecturally exciting embassies. But not only does it have a great view of the water, but this contemporary building from Gert Wingårdh and Tomas Hansen is stunning on its own. Photo by Adam Fagen.

This one came as a recommendation, and honestly, if a fountain was a part of the Dupont Walking Tour than this piece of urban architecture is worth adding here. The way the bridge rises above the ground is interesting but more importantly walking underneath the freeway along the waterfront is an experience in and of itself. Photo by Flickr user thisisbossi.

This pre-Revolutionary War home that stands as an homage to how everyday people lived is the oldest building in D.C. and is operate by the National Park Service. It's also one of D.C.'s most haunted locales. Photo by Wally Gobetz.

This historic landmark, which also functions as a museum, could be its own day long trip. This Federalist house built around the turn of the 19th century has an impressive period art collection as well. Photo by Bill Rand.

Although Tudor Place is just as well known for the impressive gardens, this early 19th century Federalist home is impressive in its own right, and not just because Martha Washington's granddaughter was responsible for the construction. Photo by Flickr users Jean & Oliver.

There's a lot of great architecture on this Jesuit University's campus, but Gothic Healy Hall, designed by Paul J. Pelz in 1877 is clearly the most notable building on campus. It's also one of two places on campus that are considered historic landmarks. Photo by Flickr user ehpien.