The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

A painfully obvious spy house sits right across the street from the Russian Embassy.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

An astounding collection of medical specimens, including bits of President Lincoln.

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

Plot your trip through the city on the sidewalk.

A hidden "place of interment for gentlemen."

A Yiddish theater turned movie house turned rock and roll landmark turned gay disco turned bank.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

A terrific purveyor of natural history objects and curios.

This neo-Gothic former auto showroom is one of the few remaining reminders of Brooklyn's "Automobile Row."

Headquarters of the world's fourth largest Hasidic sect and the first of many "770s" around the world.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

A unusual sanctuary for abused and exotic animals in South Jersey.

How this Pine Barrens hill got its name is uncertain, but on a good day the view from the fire tower is crystal clear.

Rising out of a clearing in New Jersey's Pine Barrens is an Aztec-inspired monument to the "Lindbergh of Mexico."

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

This poor little statue is the most vandalized memorial in Washington.

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

Herbert Hoover's "Brown House" rural presidential retreat was a PR disaster amid the start of the Great Depression.