The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

A painfully obvious spy house sits right across the street from the Russian Embassy.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

A massive, majestic mammal watches over pedestrians from his perch atop a former B.P.O.E. lodge.

An original apothecary from 1792.

A former major munitions plant that has been converted into a sprawling art space.

This family mausoleum is steeped in symbolism and looks more like a fantasy location than a grave.

Orcas on display and in the water.

This 50-ton ship on Orcas Island has never seen the ocean.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

The well-preserved remnants of a bridge that once made up a WW1-era military railroad.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

This pharmacist and his patient greet visitors to the National Community Pharmacists Association.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

A touching tribute to a local hero who made sure his neighborhood stayed clean.