Try not to get slimed in Tribeca.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

The home of the first American-born saint is one of the only curved buildings in New York.

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

A much-maligned monument to teetotalism.

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

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.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

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

The early data processor factory founded in Washington for the 1890 U.S. Census went on to become IBM.

At 207 feet, one of the world's longest continuous escalators.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

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

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

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

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

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Ride aboard a centuries-year-old steam engine and explore dozens of trains parts, including an unusual "comboose."

Watch the seas clash at the place where according to Maori tradition, the spirits depart for their journey to the afterlife.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

An outdoor installation of 20 vintage signs that once hung in front of businesses throughout town.