A working metal shop and venue for outrageous art and music shows in a former cannonball factory.

This collection of grinning ephemera has grown from basement to Brooklyn.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Read a book next to a Midtown waterfall.

Right next to departures—how convenient!

This unique historical monument features large concrete spheres designed to resemble fallen stars.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

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

Literal "money laundering."

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

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

A secret greenspace hides atop a Capitol parking garage.

The tunnel under the Capitol Building where Congress takes out its trash.

A line of blue paint marks the route of the inaugural parade.

Every drop of D.C. tap water flows through this old waterworks.

A surprising, but overlooked example of geology in the middle of the nation’s capital.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

An 18-mile-long tunnel for sewage waste will soon wind within the bowels of Washington, D.C.

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

The elevator that makes it possible to fly American flags in bulk over the U.S. Capitol

Need a hardcopy of the 50-title Code of Federal Regulations? This is the place.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

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

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.