The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

During the holidays, a vintage subway train whisks New Yorkers back in time.

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

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

A very classy 1920s-era bar right in Grand Central Station.

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.

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

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

Tucked in the back of this amazing antique store is an important piece of medical history.

The maze-like transportation hub contains abandoned areas, derelict stores, and a resident bat colony.

The only quarter of the Old City not dedicated to a major world religion.

Black cat statues guard this temple-like Egyptian revival factory.

Grotto replete with mystical designs laid out in glued shell mosaics.

Eyam took steps to quarantine themselves and keep the plague from spreading.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

Fascinating town where normal life interfaces with the occult.

Catacombs turned marketplace.

Famously misunderstood wonder of the ancient world

Hidden beneath the streets of London is a secret subway that only carried mail.

Ireland's only German military cemetery holds the remains of a spy who was moved there under the cover of darkness.