The last moments of the ill-fated Pompeiians, frozen forever in plaster.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

Since 1920, one small company has defined the distinctive chairs of Paris' sidewalk bistros.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

Detailed facade of a brownstone in Boerum Hill.

An annual extravaganza of Broadway theater memorabilia.

A decommissioned military complex that's now a modern industrial park.

A hidden architectural treasure in New York's Brooklyn.

A ruthless Soviet relocation campaign birthed a new cuisine, and this humble restaurant.

A small graveyard is hidden in the midst of a bustling university campus.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

The graveyard holds the remains of Irish immigrants who arrived in Queens after fleeing the Great Famine.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

Historical figures from New York City's Catholic community reside in Midtown.

A partially hidden wall graffitied by spectators of the 1976 Bicentennial, recently rediscovered.

This recently uncovered ad for Lindsay's run at Mayor in 1965 had been hiding for decades underneath a billboard.

A Bed-Stuy gymnasium that hosts expansive raves, performances, dance parties, and more.

A one-ton statue of Steve Rogers beautifies the entry to a Brooklyn Bed, Bath & Beyond.

An illegally built ramshackle mansion tucked in the middle of Brooklyn is now being turned into condominiums.