The 320-year-old tree that greeted General Lafayette and rerouted an interstate highway.

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

A memorial in coal country commemorates the victims of an all-too-preventable mining disaster.

This tiny man looms large over downtown Charleston.

A humble plaque marks the site where the country music legend was found dead in his Cadillac.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

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

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.