The U.S. Fish Commission’s effort to mass produce carp.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

The only tennis court that falls under the jurisdiction of the central bank.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

A portal into the bricked up canal that runs through the heart of Washington D.C.

Before Nixon, "watergate" meant canals.

A historic ruin just 20 feet away from a busy highway onramp.

An overlooked tribute to one of the most important peace deals in American history.

This lovely burial mound is actually a replica that was installed after archeologists excavated the original.

A museum and doll store featuring a surreal and super sanitized version of where babies come from.

A prehistoric landscape hidden in the cliffs of Maha'ulepu.

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

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

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

Built in 1945, this historic train station has a new lease on life with its baggage area serving as an event space.

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

The headquarters of the Audubon Naturalist Society is a small slice of heaven for nature lovers.

One of the largest collections of Catalan literature and cultural materials outside of Spain, created by a community of 1960s expats.

This mighty white oak in Bethesda survived both the American Revolution and the construction of Washington D.C.'s metro red line.

The wooded estate of the Forest Service employee responsible for D.C.’s cherry blossom trees.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

Surrounded by traditional homes, this Tolkien-esque dwelling stands out on a quiet street in suburban Maryland.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.