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.

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

The "lovely red Vega" of the legendary record-settling pilot.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Recovered from the brink of extinction, at home in the Financial District.

Golden Gate Park's historic collection of plants.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A daily replay of the experiment that proved the rotation of the Earth.

Yo, Adrian!

Dr Barnes' $25 billion private collection of art and arboretum.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

2300-year-old Roman road connecting the empire.

Elevated freight railway turned wildly successful urban park.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The 28-foot granite map plots the locations of 40 theaters in New York City.

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

There must be a pun in this haystack somewhere...

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

These docile dragons are ideal inhabitants for the conservatory greenhouses.