This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

A huge maze complex and whimsical miniature village in Tasmania.

An exercise in radical design and social living that became the epicenter of Soviet spy networks in London.

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

A museum dedicated to secret surveillance.

Home to items never before seen by the public.

The first (but not only) upside-down house in Germany.

There is a small island in the Gulf of Nicoya where the only human inhabitants are dead.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Located inside a former record pressing plant, this recording studio pays homage to the techniques and gear of a bygone age.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

Order scoops of pandan, lychee, and black sesame at this family-run institution.

Mexican food and folk art.

This replica of the Greek structure is in the heart of Nashville.

A humble garage, world-famous for being the epicenter of a technology revolution.

Where a railroad loops under or over itself to rise or drop more than 70 feet in a short distance.

The nearly 200-year-old building displays a perplexing grammatical error.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

A lonely monument to the original Silicon Valley tech campus.

Local lore holds that Butch Cassidy took an escape route through Red Canyon's sandstone hoodoos after an attempted murder.

A stone copper was sculpted on the wall of the Carlisle Cathedral to honor a local hero.