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

A tribute to the beloved, kind-hearted "homeless mayor" of Silver Spring.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

The rooster who crossed the road lives on forever in Takoma Park, Maryland.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

The span is crooked and made from two older recycled bridges.

The United States Capitol's former columns still stand.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

A super-sized promotional trick that is now a D.C. landmark.

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

This statue of the "father of television" stands prominently in the United States Capitol.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

A historic arena where the Beatles played their first concert in the U.S.

The towering figures were created from the cemetery's fallen old-growth trees.

This grisly headstone doesn’t seem to be resting in peace.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The oldest continuously operating fish market in the United States.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.