A gift from Japan, 17th-century lantern stands among the cherry trees at D.C.'s Tidal Basin.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

The last remaining building in Washington, D.C., built by H.H. Richardson, one of America's most iconic architects.

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 National Park Service’s best-kept secret with views that rival any in D.C.

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

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

Also known as the Founding Church of Scientology.

Look closely and you’ll notice that the color changes a third of the way up the tower.

There’s a special club house at the top for the bell ringers.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

Washington's iconic carousel has a nice piece of Civil Rights history.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

Largest Roman Catholic church in North America.

A nostalgic bibliographic gem.

The national park was once a plantation estate.

The oldest continuously operating fish market in the United States.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The site of the climactic scene from the classic horror film is now a historic landmark.

This landmark honoring a local beer brand is an iconic part of the Minneapolis skyline.

This old residential building was once the largest flour mill in the world.

One of the world's premier laboratories for hydraulic engineering research takes full advantage of the water's power.

Downtown Minneapolis mixed art and function by turning some of their sewer covers into works of art.