Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

The trials and tribulations of marking Poe's grave.

Baltimore's first skyscraper may be home to the inspiration behind pulp fiction's most celebrated bird.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Once America's tallest structure, now a Baltimore landmark.

One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

This historic building is now home to the Public Access Corporation for the District of Columbia.

Largest Roman Catholic church in North America.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

A clone of a cloned tree that was so important it allegedly had its own guards.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

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

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

A secret greenspace hides atop a Capitol parking garage.

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

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