The building that inspired Shirley Jackson's "The Haunting of Hill House."

A beautiful, creepy 19th-century castle stands incongruous in rural Vermont.

A small chapel celebrating the spiritual bond between dogs and humans.

A French-Colonial era collection of taxidermy and wet specimens, secreted away in the National University of Hanoi.

A museum filled with tiny, adorable versions of the mighty Royal Danish Navy.

Hotel designed by indie graphics artists.

The only surviving piece of Copenhagen's 16th-century defensive wall.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

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

Volunteer-run library dedicated to exploring five decades of activism history.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Unique antiquarian shop specializing in globes, maps, and prints.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

An unassuming secret door once led to a legendary watering hole.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

The remains of the great moral philosopher reside in a university in London.

These morbid carvings remind churchgoers of the inevitability of death.