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

This stained glass window designed by Tiffany Studios is hidden behind the circulation desk of a public library.

This relic of 19th-century infrastructure is one of the few remaining coal gas storage tanks in the U.S.

This giant monument of the RCA mascot is a beloved fixture in Albany, New York.

The schoolhouse where Jesse Merwin, the inspiration for the "The Legend of Sleepy Hollow" character, once taught.

A small Second Empire-style building is one of only seven remaining lighthouses on the Hudson River.

The Hudson River School comes alive at this palatial estate.

Money may not grow on trees, but it can be dispensed by one.

A monument to the Mohawk people stands along an old Native American trade route.

The place where travelers of the Mohawk Trail forded the Deerfield River rather than pay the toll at the turnpike bridge.

At this farm in upstate New York, the former president plotted his reelection campaign.

A nearly 100-year-old dining car in upstate New York embodies the golden age of roadside dining.

A living antique aviation museum in the historic town of Red Hook, New York.

This forlorn park is the result of a failed investment turned tax dodge.

Glacial erratic or man-made dolmen? It probably wasn't druids.

This high-perched pachyderm marks the memory of not one, but two elephants gunned down in small New England towns.

Over 50 whirling pools left behind from the glacial age.

One of the most scenic falls in Massachusetts has a history of death and grim legend.

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

One of few remaining antique carousels with stationary animals in the U.S.

The final resting place of New England's last "vampire."

Only a shrine remains at the site of the catastrophic nightclub inferno that killed 100 Great White fans.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

The first ever diner included on the National Register of Historic Places is famous for its custard French toast.