Possible relics of the ancient Roman city are hidden in this restaurant's façade.

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

An extraordinary collection of vampire-themed antiques lurks on the second floor of a store.

A New Jersey state park that was once Napoleon's brother's sprawling estate.

A simple plaque remembers an act of WWI terrorism that obliterated an island and forever scarred the Statue of Liberty.

Carved, egg-shaped stone with no explanation.

Murder scene memorialized in perpetuity by grisly obelisk.

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

One of the oldest active carousels in the country—but it might be missed by all but the keenest-eyed boardwalk strollers.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

A pair of mutilated bronze octopuses slump at the base of the monument honoring California's admission to the U.S.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

The memorial to the victims of the Jonestown Massacre carries the names of 918 lost, including one name people wish wasn't there.

This preserved wilderness hides the remains of a colonial grain mill used to feed George Washington's troops.

New York's oldest concrete structure is being preserved thanks to the gentrification of Whole Foods.

A mysterious, abandoned building rotting on the Brooklyn waterfront.

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

Two mermen, eternally spitting into each other's mouths.

A beautiful multicolored mound formed by the mineral deposits of the Orenda Spring.

A condo complex once housed a boarding school with the 24th U.S. Vice President among its notable alumni.

Dinosaurs, magic, and wonder are hidden amid the forests of Allaire State Park.

A billionaire heiress' menagerie of animals were lovingly laid to rest on the grounds of her former estate.