Hidden

A southern Swedish island is home to the last ERSTA artillery battery, meant to protect the shoreline during the Cold War.

Although it has never been a secret ninja base, this shrine still has plenty of tricks up its sleeve.

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

This hidden fortress has been coined the "City of Ghosts."

In this beloved beach town, a secret seafood haven lies tucked behind a car wash.

Some of New York's best tacos can be found in the back of an unassuming bodega in Queens.

Many of Edinburgh's more unsavory characters spent their final days behind this door while awaiting their executions.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

Cool down and fill up after visiting Teotihuacán at this bar and restaurant in a deep, underground cave.

Hidden for more than a century, the grave of the Conquistador remains forgotten behind these church walls.

This Aztec structure remained hidden until the demolition of a supermarket exposed the lost temple.

More than 250 sakes are available in an izakaya hidden in the basement of a Midtown office building.

Silverware in the sidewalk outside a grocery store cements this neighborhood’s Italian culinary history.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.