Retribution for death of infamous mob boss Franie Yale was a case of mistaken identity.

The site where Joe Gallo kept his guns, pet lion, and launched an all out mob war in 1960s Brooklyn.

Where infamous mobster and leader of Murder Inc. Albert Anastasia made his home.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

The one-time epicenter of American songwriting is now a little remembered Manhattan commercial block.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

A strangely angled West Village home is the only monument to an explosion that took the lives of three American revolutionaries.

The highest point on the island known for buildings that touch the sky.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

The notorious headquarters of a corrupt political machine.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

Salute the leader of the proletariat.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

Relics given to a Manhattan church to avoid seizure by the Italian government.

The former hotel where Tesla invented the radio.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

The gravestone of an eccentric Connecticut doctor features dinosaur tracks and a pair of fossil tree casts.

Public outcry led to this bridge's unique character which celebrates a giant frog battle and also sewing.

Memorial to one of the most fatal fires in both circus and U.S. history.

Final resting place of a New Haven urban legend.

The oldest place in Hartford is a cemetery with thousands of bodies stacked beneath the grass.

These etchings reveal the history of a long-gone quarantine site.

The headquarters of the famous Yale society.

The "possessed" house that inspired "The Haunting in Connecticut" book and movie.